When water is subjected to high pressure, such as 20 MPa, its temperature increases due to the work done on it, which in turn raises its density. Unlike gases, the density of liquids like water does not depend on temperature in the same way, but compressing water in a closed container results in an increase in temperature and density. Water exhibits a maximum density at 4°C under normal pressure, but this characteristic does not significantly alter the temperature-pressure-density relationship when high pressure is applied. The behavior of water under compression aligns closely with that of other liquids, despite its unique molecular structure.
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The density of a liquid doesn't depend on the temperature in the same way as a gas.ryan albery said:does it get hotter (and thus less dense), colder (more dense), or does it's temperature stay the same?
Clarification: if a fluid (gas or liquid) isn't volume constrained, the density does vary roughly linearly with temperature, along a pretty wide range.mgb_phys said:The density of a liquid doesn't depend on the temperature in the same way as a gas.
Well yes, as it gets close to the point where the phase changes, it starts behaving differently. Outside of that, it can be pretty linear.Water in particular is complicated by the bonds rearranging themselves - which is why water has a maximum density at a temperature of 4C (at normal pressure)
If you take an unconstrained volume of water and increase the temperature, the volume will increase roughly linearly with the temperature along most of the temperature range available (3-100C, give or take).ryan albery said:Yeah, intuitively I feel that compressing something (doing work) will increase the temperature, but with water, won't that will make it less dense?