# Water pressure and temperature relationship

### Boiling point - Wikipedia

The easiest way to understand the PvT relation is to generate it by a thought The pressure will remain constant and the temperature of the water will begin to. In a closed system where volume is held constant, there is a direct relationship between Pressure and Temperature. In a direct relationship, one variable follows . Yes, at constant density, the pressure increases as the temperature does: Temperature vs Pressure vs Density - Water. For example, having.

## Pressure, temperature, and volume relation in liquids

Beyond its triple point, a compound's normal boiling point, if any, is higher than its melting point. Beyond the critical point, a compound's liquid and vapor phases merge into one phase, which may be called a superheated gas.

At any given temperature, if a compound's normal boiling point is lower, then that compound will generally exist as a gas at atmospheric external pressure.

Pressure, Volume and Temperature Relationships

If the compound's normal boiling point is higher, then that compound can exist as a liquid or solid at that given temperature at atmospheric external pressure, and will so exist in equilibrium with its vapor if volatile if its vapors are contained. If a compound's vapors are not contained, then some volatile compounds can eventually evaporate away in spite of their higher boiling points. Boiling points of alkanesalkenesethershalogenoalkanesaldehydesketonesalcohols and carboxylic acids as a function of molar mass In general, compounds with ionic bonds have high normal boiling points, if they do not decompose before reaching such high temperatures.

Many metals have high boiling points, but not all. Very generally—with other factors being equal—in compounds with covalently bonded moleculesas the size of the molecule or molecular mass increases, the normal boiling point increases.

### Vapour pressure of water - Wikipedia

When the molecular size becomes that of a macromoleculepolymeror otherwise very large, the compound often decomposes at high temperature before the boiling point is reached. Another factor that affects the normal boiling point of a compound is the polarity of its molecules.

As the polarity of a compound's molecules increases, its normal boiling point increases, other factors being equal. At the other end of the pipe is the incoming city water company city pressure. Water temperature is 20 degrees celsius room temp in the pipe originally, and a pressure of "1". Then the city increases water pressure to "2". The units do not matter, just say the pressure doubled. The water did not move, because the tap was shut.

## Water's Unexpected Properties

Yet the static pressure doubled. 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? 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.