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Using ultracold temperatures and some steel ball bearings, scientists have created a brand-new, bizarre form of ice that has the same density of liquid water.

The ice, known as medium-density amorphous ice, fits into a gap in the annals of frozen water that scientists weren’t sure would ever be filled. Unlike the crystalline ice that forms naturally on Earth, the newly created ice doesn’t have an organized molecular structure. Instead, its molecules are in a chaotic mismatch, more like glass — a state known as amorphous. Other types of amorphous ice have been made before, but they’ve been either much less dense or far denser than liquid water. This new Goldilocks version of amorphous ice is right in the middle, almost exactly matching liquid water’s density, researchers explained in a new study published in the journal Science today (Feb. 2).

“It’s something completely new,” said study senior author Christoph Salzmann (opens in new tab) , a professor of physical and materials chemistry at University College London.Grinding ice

When ice freezes normally on Earth, its molecules stack into an organized crystalline structure. This crystalline ice is one of the weird quirks of H2O, because it floats on liquid water in its solid state rather than sinking. This is due to the relatively big gaps in the crystal structure of water ice, compared with other materials that form denser structures when they crystallize. 

When properly manipulated, though, liquid water can also freeze in a disorganized, amorphous state. The first of these states, low-density amorphous ice, was discovered in the 1930s. It’s made by depositing water vapor on very cold surfaces. This process happens naturally in space, Salzmann said, so low-density amorphous ice may be the most common form of ice in the universe. 

In the 1980s, researchers discovered that they could also make high-density amorphous ice by compressing regular ice at very low temperatures. But no one ever had ever made amorphous ice with a medium density — that is, until Salzmann and his colleagues had a “crazy Friday afternoon idea.” They decided to try ball milling ice. 

A ball mill is a device kind of like a very advanced cocktail shaker. A material is put into a chamber with stainless-steel balls and shaken or turned until the material is ground up. Ball milling is used in many industries, but it’s particularly good at creating amorphous materials and at grinding soft, frozen materials into powders, Salzmann said. 

“We said, ‘Why don’t we ball mill ice and see what happens?'” Salzmann said.Weird properties

The researchers expected that the ball mill would just break the ice crystals into smaller ice crystals. But that’s not what happened. Instead, the tumbling steel balls sheared and compressed the ice crystals, shoving them into a new state of disorganization. The result? Medium-density amorphous ice.

Computer modeling showed that the ice starts in a nice, crystalline state, its hydrogen bonds forming a hexagonal lattice. The random shearing from the ball-milling pushes these hydrogen bonds this way and that, leaving them pointing up and down in a chaotic zigzag.

The new form of ice forms at 77 kelvins, or minus 321 degrees Fahrenheit (minus 196 degrees Celsius). It has some odd properties beyond its density of 1.06 grams per cubic centimeter (0.037 ounces per 0.06 cubic inches).. (Water has a density of 1 gram per cubic centimeter, or 0.035 punches per 0.06 cubic inches.) Among them, Salzmann said, is that when the researchers compressed the medium-density ice and heated it to minus 185 F (minus 120 C), the ice recrystallized, releasing a large amount of heat.

“With other forms of [amorphous] ice, if you compress them and you release the pressure, it’s like nothing happened,” Salzmann said. “But the MDA [medium-density amorphous ice] somehow has this ability to store the mechanical energy and release it through heating.”Related stories—Why is water important?

—Does pure water exist?

—New study turns understanding of ice upside-down

Medium-density amorphous ice might occur naturally on the ice moons of gas giant planets, Salzmann said, where the gravitational forces of the enormous worlds compress and shear the moons’ ice. If so, the mechanical energy stored in this form of ice could influence the tectonics on these Hoth-like moons.

Understanding medium-density amorphous ice could also help researchers understand liquid water better more generally, Salzmann said. Water is odd not only because its crystalline form floats but also because it has other unique properties, like high surface tension and high melting and boiling points. Scientists still debate the nature of water at extremely low temperatures. Any debate now needs to take into account medium-density amorphous ice, Salzmann said.

“A lot of our understanding of liquid water was built on the pillars that there is low-density and high-density amorphous ice,” he said. “How does the medium-density amorphous ice fit into that picture?”

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Donald Trump announces sweeping global trade tariffs – including 10% on UK imports

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Donald Trump announces sweeping global trade tariffs - including 10% on UK imports

Donald Trump has announced a 10% trade tariff on all imports from the UK – as he unleashed sweeping tariffs across the globe.

Speaking at a White House event entitled “Make America Wealthy Again”, the president held up a chart detailing the worst offenders – which also showed the new tariffs the US would be imposing.

“This is Liberation Day,” he told a cheering audience of supporters, while hitting out at foreign “cheaters”.

Follow live: Trump tariffs latest

He claimed “trillions” of dollars from the “reciprocal” levies he was imposing on others’ trade barriers would provide relief for the US taxpayer and restore US jobs and factories.

Mr Trump said the US has been “looted, pillaged, raped, plundered” by other nations.

President Donald Trump holds a signed executive order during an event to announce new tariffs in the Rose Garden of the White House, Wednesday, April 2, 2025, in Washington. (AP Photo/Evan Vucci)
Image:
Pic: AP

His first tariff announcement was a 25% duty on all car imports from midnight – 5am on Thursday, UK time.

Mr Trump confirmed the European Union would face a 20% reciprocal tariff on all other imports. China’s rate was set at 34%.

The UK’s rate of 10% was perhaps a shot across the bows over the country’s 20% VAT rate, though the president’s board suggested a 10% tariff imbalance between the two nations.

It was also confirmed that further US tariffs were planned on some individual sectors including semiconductors, pharmaceuticals and critical mineral imports.

Please use Chrome browser for a more accessible video player

Trump’s tariffs explained

The ramping up of duties promises to be painful for the global economy. Tariffs on steel and aluminium are already in effect.

The UK government signalled there would be no immediate retaliation.

Business and Trade Secretary Jonathan Reynolds said: “We will always act in the best interests of UK businesses and consumers. That’s why, throughout the last few weeks, the government has been fully focused on negotiating an economic deal with the United States that strengthens our existing fair and balanced trading relationship.

“The US is our closest ally, so our approach is to remain calm and committed to doing this deal, which we hope will mitigate the impact of what has been announced today.

“We have a range of tools at our disposal and we will not hesitate to act. We will continue to engage with UK businesses including on their assessment of the impact of any further steps we take.

“Nobody wants a trade war and our intention remains to secure a deal. But nothing is off the table and the government will do everything necessary to defend the UK’s national interest.”

Please use Chrome browser for a more accessible video player

Who showed up for Trump’s tariff address?

The EU has pledged to retaliate, which is a problem for Northern Ireland.

Should that scenario play out, the region faces the prospect of rising prices because all its imports are tied to EU rules under post-Brexit trading arrangements.

It means US goods shipped to Northern Ireland would be subject to the EU’s reprisals.

The impact of a trade war would be expected to be widely negative, with tit-for-tat tariffs risking job losses, a ramping up of prices and cooling of global trade.

Research for the Institute for Public Policy Research has suggested more than 25,000 direct jobs in the UK car manufacturing industry alone could be at risk from the tariffs on car exports to the US.

The Society of Motor Manufacturers and Traders (SMMT) had said the tariff costs could not be absorbed by manufacturers and may lead to a review of output.

The tariffs now on UK exports pose a big risk to growth and the so-called headroom Chancellor Rachel Reeves was forced to restore to the public finances at the spring statement, risking further spending cuts or tax rises ahead to meet her fiscal rules.

Read more:
What do Trump’s tariffs mean for the UK?
The rewards and risks for US as trade war intensifies

A member of the Office for Budget Responsibility (OBR), David Miles, told MPs on Tuesday that US tariffs at 20% or 25% maintained on the UK for five years would “knock out all the headroom the government currently has”.

But he added that a “very limited tariff war” that the UK stays out of could be “mildly positive”.

He said: “There’s a bit of trade that will get diverted to the UK, and some of the exports from China, for example, that would have gone to the US, they’ll be looking for a home for them in the rest of the world.

“And stuff would be available in the UK a bit cheaper than otherwise would have been. So there is one, not central scenario at all, which is very, very mildly potentially positive to the UK. All the other ones which involve the UK facing tariffs are negative, and they’re negative to very different extents.”

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Politics

‘My lawyers are ready’ for questions about corruption claims, ex-minister tells Sky News

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'My lawyers are ready' for questions about corruption claims, ex-minister tells Sky News

Tulip Siddiq has told Sky News her “lawyers are ready” to handle any formal questions about allegations she is involved in corruption in Bangladesh.

Asked whether she regrets apparent links with the Bangladeshi Awami League political party, Ms Siddiq said “why don’t you look at my legal letter and see if I have any questions to answer… [the Bangladeshi authorities] have not once contacted me and I’m waiting to hear from them”.

The London MP resigned as a Treasury minister in January after being named in several corruption inquiries in Bangladesh.

In her first public comments since leaving government, Ms Siddiq said “there’s been allegations for months on end and no one has contacted me”.

Last month, the interim leader of Bangladesh told Sky News the MP had “wealth left behind” in the country “and should be made responsible”.

Lawyers acting for Ms Siddiq wrote to the Bangladeshi Anti Corruption Commission (ACC) several weeks ago saying the allegations were “false and vexatious”.

The letter said the ACC must put questions to Ms Siddiq “by no later than 25 March 2025” or “we shall presume that there are no legitimate questions to answer”.

More on Bangladesh

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Staff from the NCA visited Bangladesh as part of initial work to support the interim government in the country.

In a post online today, the former minister said the deadline had expired and the authorities had not replied.

Sky News has approached the Bangladeshi government for comment.

The allegations against Ms Siddiq are focused on links to her aunt Sheikh Hasina – who served as the prime minister of Bangladesh for 20 years.

Ms Hasina was forced to flee the country in August following weeks of deadly protests.

She is accused of becoming an autocrat, with politically-motivated arrests, extra-judicial killings and other abuses allegedly happening on her watch. Hasina claims it’s all a political witch hunt.

Electrocuted on their genitals and mouths sewn up: Inside Bangladesh’s ‘death squad’ jails

Ms Siddiq was found to have lived in several London properties that had links back to the Awami League political party that her aunt still leads.

She referred herself to the prime minister’s standards adviser Sir Laurie Magnus who said he had “not identified evidence of improprieties” but added it was “regrettable” Ms Siddiq had not been more alert to the “potential reputational risks” of the ties to her aunt.

Ms Siddiq said continuing in her role would be “a distraction” for the government but insisted she had done nothing wrong.

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World

Donald Trump announces sweeping global trade tariffs – including 10% on UK imports

Published

on

By

Donald Trump announces sweeping global trade tariffs - including 10% on UK imports

Donald Trump has announced a 10% trade tariff on all imports from the UK – as he unleashed sweeping tariffs across the globe.

Speaking at a White House event entitled “Make America Wealthy Again”, the president held up a chart detailing the worst offenders – which also showed the new tariffs the US would be imposing.

“This is Liberation Day,” he told a cheering audience of supporters, while hitting out at foreign “cheaters”.

Follow live: Trump tariffs latest

He claimed “trillions” of dollars from the “reciprocal” levies he was imposing on others’ trade barriers would provide relief for the US taxpayer and restore US jobs and factories.

Mr Trump said the US has been “looted, pillaged, raped, plundered” by other nations.

President Donald Trump holds a signed executive order during an event to announce new tariffs in the Rose Garden of the White House, Wednesday, April 2, 2025, in Washington. (AP Photo/Evan Vucci)
Image:
Pic: AP

His first tariff announcement was a 25% duty on all car imports from midnight – 5am on Thursday, UK time.

Mr Trump confirmed the European Union would face a 20% reciprocal tariff on all other imports. China’s rate was set at 34%.

The UK’s rate of 10% was perhaps a shot across the bows over the country’s 20% VAT rate, though the president’s board suggested a 10% tariff imbalance between the two nations.

It was also confirmed that further US tariffs were planned on some individual sectors including semiconductors, pharmaceuticals and critical mineral imports.

Please use Chrome browser for a more accessible video player

Trump’s tariffs explained

The ramping up of duties promises to be painful for the global economy. Tariffs on steel and aluminium are already in effect.

The UK government signalled there would be no immediate retaliation.

Business and Trade Secretary Jonathan Reynolds said: “We will always act in the best interests of UK businesses and consumers. That’s why, throughout the last few weeks, the government has been fully focused on negotiating an economic deal with the United States that strengthens our existing fair and balanced trading relationship.

“The US is our closest ally, so our approach is to remain calm and committed to doing this deal, which we hope will mitigate the impact of what has been announced today.

“We have a range of tools at our disposal and we will not hesitate to act. We will continue to engage with UK businesses including on their assessment of the impact of any further steps we take.

“Nobody wants a trade war and our intention remains to secure a deal. But nothing is off the table and the government will do everything necessary to defend the UK’s national interest.”

Please use Chrome browser for a more accessible video player

Who showed up for Trump’s tariff address?

The EU has pledged to retaliate, which is a problem for Northern Ireland.

Should that scenario play out, the region faces the prospect of rising prices because all its imports are tied to EU rules under post-Brexit trading arrangements.

It means US goods shipped to Northern Ireland would be subject to the EU’s reprisals.

The impact of a trade war would be expected to be widely negative, with tit-for-tat tariffs risking job losses, a ramping up of prices and cooling of global trade.

Research for the Institute for Public Policy Research has suggested more than 25,000 direct jobs in the UK car manufacturing industry alone could be at risk from the tariffs on car exports to the US.

The Society of Motor Manufacturers and Traders (SMMT) had said the tariff costs could not be absorbed by manufacturers and may lead to a review of output.

The tariffs now on UK exports pose a big risk to growth and the so-called headroom Chancellor Rachel Reeves was forced to restore to the public finances at the spring statement, risking further spending cuts or tax rises ahead to meet her fiscal rules.

Read more:
What do Trump’s tariffs mean for the UK?
The rewards and risks for US as trade war intensifies

A member of the Office for Budget Responsibility (OBR), David Miles, told MPs on Tuesday that US tariffs at 20% or 25% maintained on the UK for five years would “knock out all the headroom the government currently has”.

But he added that a “very limited tariff war” that the UK stays out of could be “mildly positive”.

He said: “There’s a bit of trade that will get diverted to the UK, and some of the exports from China, for example, that would have gone to the US, they’ll be looking for a home for them in the rest of the world.

“And stuff would be available in the UK a bit cheaper than otherwise would have been. So there is one, not central scenario at all, which is very, very mildly potentially positive to the UK. All the other ones which involve the UK facing tariffs are negative, and they’re negative to very different extents.”

Continue Reading

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