The density of water is at one atmospheric pressure (105Pa), and the maximum density of water is at 4℃ (1g/cm3). When the temperature is lower than or higher than 4℃, the density is less than 1g/cm3.

The unit for calculating water is tons or cubes, and there is no degree. If you read by the water meter, a number represents one ton or one party can also say once, once = one party = one ton of water.

1 m3 capacity: it is equivalent to the volume of a cube whose length, width and height are all equal to 1 m.

Extended data:

Density variation law

Generally speaking, no matter what substance, no matter what state it is in, the volume or density will change accordingly with the change of temperature and pressure. The relationship between temperature T, pressure P and density ρ (or volume) is called the equation of state. The volume of a gas varies significantly with the pressure it is subjected to and the temperature it is at.

For an ideal gas, the equation of state is, where r is the gas constant, which is equal to 287. 14m2 (2* seconds). If its temperature is constant, the density is proportional to the pressure; If its pressure is constant, its density is inversely proportional to its temperature.

For general gas, if the density is not large and the temperature is far from the liquefaction point, its volume changes with pressure close to the ideal gas; For high-density gases, the above equation of state should also be modified appropriately.

When the temperature and pressure change, the density of solid or liquid matter changes only slightly. For example, in the vicinity of 0℃, the temperature coefficients of various metals (the rate of change of object volume when the temperature rises 1℃) are mostly around 10-9.

The pressure in deep water and underwater explosion can reach hundreds of atmospheres or even higher (1 atmosphere = 10 1325 Pa), so the change of density with pressure must be considered. R.H. Cole put forward the following equation of state:

Where p0 is the density of water at one atmosphere. If n and b are 7 and 3000 atmospheres respectively, the error between the above formula and the measured data is within a few percent, until 105 atmospheres.

As far as the whole nature is concerned, extreme pressure will make the density of matter in some celestial bodies very different from the ordinary density.

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