Scientists discover new state of supercooled water

Recently, researchers at Stockholm University achieved a major breakthrough, finding definitive evidence for a "liquid-liquid critical point" in supercooled water.

orgStockholm University

conceptliquid-liquid critical point

conceptsupercooled water

By using ultra-fast X-ray lasers, the team successfully observed water shifting between two liquid phases: a low-density liquid (LDL) and a high-density liquid (HDL).

techX-ray laser

conceptlow-density liquid

concepthigh-density liquid

This discovery, published in the journal Science, resolves a debate lasting over 30 years.

orgScience

This technological feat finally pulls back the "crystallization curtain," proving that water’s hidden complexity is essential to its identity as the most vital molecule on Earth.

locationEarth

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Comprehension Questions

What is supercooled water?

Liquid water cooled below its freezing point without becoming ice.

Water that contains many impurities and dust.

Water that has been boiled at high pressure.

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Correct Choice

Liquid water cooled below its freezing point without becoming ice.

Where was the critical point for water identified?

At 0 °C and standard atmospheric pressure.

At 100 °C and very high pressure.

At approximately -63 °C and 1,000 atmospheres of pressure.

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Correct Choice

At approximately -63 °C and 1,000 atmospheres of pressure.

Why was studying supercooled water historically difficult?

It crystallizes almost instantly into ice, making it highly unstable.

It required equipment only available in space.

The water would evaporate before it could be measured.

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Correct Choice

It crystallizes almost instantly into ice, making it highly unstable.

What are the two liquid phases of water discovered by the researchers?

Cold liquid and boiling liquid.

Frozen liquid and gaseous vapor.

Low-density liquid (LDL) and high-density liquid (HDL).

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Correct Choice

Low-density liquid (LDL) and high-density liquid (HDL).

How did researchers manage to observe the critical point?

By cooling water extremely slowly over several years.

By using standard optical microscopes to view ice crystals.

They used ultra-fast X-ray laser technology to capture data before the ice formed.

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Correct Choice

They used ultra-fast X-ray laser technology to capture data before the ice formed.

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