# Liquid temperature and pressure relationship

### Pressure, temperature, and volume relation in liquids | Physics Forums

Pressure-Volume-Temperature Relationships of Liquid Normal Deuterium1. Abraham Pressure-Temperature-Liquid Density Relations of Pure Hydrocarbons. Pressure and temperature (along with density or specific volume) are related by Equation of State. For gaseous fluids the ideal gas relation (p.V. temperature and pressure, approximately the same for all substances. If this relation ITere applied to the liquid state, an expression for liquid density might be .

Would the temperature rise, twice as much to 40 degrees celsius due to the pressure increase? For simplicity, let's say the copper pipe never expanded and none of the taps can leak. Liquids transmit pressure - but, when they are not moving, AFAIK they hold a static pressure, almost like a "charge". I wonder if since liquids are virtually incompressible, an increase in static pressure causes the liquid to heat up ideally.

We could think of a liquid under pressure like a gas under pressure which cannot change volume, due to its special container that doesn't let it change volume the liquid itself! Yes, but ideal liquids?

## Pressure, temperature, and volume relation in liquids

As for solids - well supposedly the fairly solid "earth" is under pressure causing tremendous heat in the center - kind of empirical evidence that pressure causes heat in solids. So this might answer my question - but still! I have to ask about liquids specifically too. Or more pumps are added in series? I am also having trouble seeing how static water pressure can be increased without the pump turbine blades snapping in half due to the virtuallly incompressible water.

I can visualize the dynamic pressure increasing once someone turns a tap on - but static pressure of liquids is a bit more tricky to visualize.

Can a pump simply "shudder" and basically stay static, but still waste energy performing molecular work - increasing static pressure but not moving the water as a whole. Doesn't a pump motor have to move somewhat in order to perform work - but if the water cannot move.??? Well I suppose it is like turning on an electric lawn mower, and having a man grab the blade and hold it in one static position.

The contents coming out of the can also cool in temperature but for another reason. Outside of the can the volume is not held constant. Thus the contents are free to expand when they move from the high pressure in the can to the low pressure outside of the can. Expansional cooling causes the contents coming out of the can to cool.

This effect can be noticed in spray-on deodorants. In the second example, a compressor is shown. This is used in appliances such as refrigerators.

### Temperature and Pressure Effects

The refrigerant air is pressurized into the compressor meaning the pressure increases as more air is squeezed into the same volume. This causes a temperature increase.

With time, this heat is lost to the environment through coils. Additional heat is given off as the refrigerant releases latent heat by turning from a gas to a liquid as it cools. The compressor will be location is a position such as the back of the refrigerator.