Why water freezes at low pressure?

In summary, when water molecules evaporate, they take energy with them and cause the remaining water to cool down. To prevent freezing at low pressure, one can either stir the water or add a soluble substance like salt to lower the freezing temperature. Evaporation is a cooling process, similar to when water is waved around in the air on a finger. Anti-freeze can also be added to water to prevent freezing.
  • #1
goku
6
0
water freezes instantly on very low pressure, irrespective the temp being well above zero. pls explain why? .what can be added to water so that it does not freeze at very low preesure (15mtorr)?
 
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  • #2
When evaporating water molecules detach from the condensed phase, they take energy with them. The remaining material cools down at the interface. So you could stir the water to maintain the temperature above freezing, or you could add something soluble (like salt) to depress the freezing temperature.
 
  • #3
evaporation is a coolong process . just like when you put water on your finger and wave it around in the air it feels cooler , you could put anti-freeze in it.
 

1. Why does water freeze at low pressure?

Water freezes at low pressure because the molecules of water are more spread out, making it harder for them to form strong bonds and stay in a liquid state. As pressure decreases, the molecules have more room to move and form the rigid structure of ice.

2. How does low pressure affect the freezing point of water?

Low pressure decreases the melting point of water, meaning it will freeze at a lower temperature. This is because the decrease in pressure allows the molecules to move more freely and form a crystalline structure at a lower temperature.

3. What is the relationship between pressure and freezing point?

The relationship between pressure and freezing point is inverse. As pressure decreases, the freezing point of water also decreases. This is because the molecules are less restricted and can more easily form into a solid state.

4. Can water freeze at room temperature under low pressure?

Under normal atmospheric pressure, water will not freeze at room temperature. However, at extremely low pressures, such as in outer space, water can freeze at room temperature.

5. How does low pressure affect the density of ice?

Low pressure causes the molecules in ice to be less tightly packed, resulting in a lower density compared to liquid water. This is why ice floats on water, as it is less dense and therefore less heavy than the surrounding liquid.

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