Water under pressure and temperature effects

[jamiek]

If you apply tremendous force to water and cause extremely high pressure, it should compress and the temperature should go up - but if the heat is given away to the surroundings, does the water temp continually go up to match the surroundings? does the water temp go down underneath the surrounding temp? I would think that initially the water would give off some heat, but does this mean the water is colder since it has given off heat? And if it's colder, won't it just have to regain the heat again to match the surrounding temp. Seems confusing.

 

[256bits]

I would think that the temperature rise would be related to the amount of work that one would have to put into the water to compress it. Since the change in volume of water per change in pressure is not very much there would be little work performed and the temperature rise would be very little.

 

[haruspex]

I would think that the temperature rise would be related to the amount of work that one would have to put into the water to compress it. Since the change in volume of water per change in pressure is not very much there would be little work performed and the temperature rise would be very little.

I agree there should be very little change in temperature, but for a different reason. Given that large forces are needed to compress water, even a little compression may take significant work. But on release, I believe much of the energy would be recovered. If so, it means the work done was stored in the state of compression rather than as heat.
See e.g. http://www.criticalprocesses.com/Use%20of%20enthalpies%20to%20calculate%20energy%20needed.htm

 

[Pkruse]

If you are talking about extreme pressures, then water is more compressible than most folks think. If you are not familiar with the concept of a bulk modulus, go look it up. Think of it as a sort of poison ratio for a liquid, and you can use it in a similar manner as calculating strain energy. This is the energy you are talking about. Once you run the numbers, you will see that the amount of work done is relatively small.

 

[sardar]

I can explain the phenomenon of water under pressure and temperature effects. When water is subjected to high pressure, it can indeed compress and the temperature can increase. However, the amount of pressure and temperature increase will depend on the specific conditions and materials involved.

In the scenario described, if the heat from the water is given away to the surroundings, the temperature of the water will eventually match the surrounding temperature. This is because heat always flows from a higher temperature to a lower temperature until an equilibrium is reached. So, if the surroundings are colder, the water will continue to lose heat until it reaches the same temperature as the surroundings.

It is important to note that the temperature of water under pressure and temperature effects is not a simple linear relationship. The density and compressibility of water can change significantly under high pressure, which can affect its ability to absorb and release heat. Additionally, other factors such as the composition and properties of the surrounding materials can also play a role in the temperature changes.

Therefore, it is not accurate to say that the water is colder just because it has given off heat. The temperature of the water will depend on the specific conditions and the amount of heat it has lost or gained. And yes, if the water is colder than the surroundings, it will eventually have to regain heat to reach the same temperature as the surroundings.

In conclusion, the behavior of water under pressure and temperature effects is complex and can vary depending on the specific conditions. It is important to carefully consider all factors and variables when studying this phenomenon.