How does the density of a liquid (or gas) vary with temperature?

1.	How does the density of a liquid (or gas) vary with temperature?
Answer» Most of the liquids increase in volume with an increase in temperature, but water shows anomalous behavior. Water has the maximum volume at 4°C and maximum density at 4°C. Actually, when volume increases density decreases and when volume decreases the density increases. But water when cooled from a high temperature, contracts upto 4°C because volume decreases and expands when cooled further below 4°C and hence density of water increases when it is cooled upto 4°C while decreases when cooled further below 4°C. In other words, the density of water is maximum at 4°C equal to 1 g Cm^-3 or lOOO kg m^-3.

Answer»

Most of the liquids increase in volume with an increase in temperature, but water shows anomalous behavior. Water has the maximum volume at 4°C and maximum density at 4°C.

Actually, when volume increases density decreases and when volume decreases the density increases.

But water when cooled from a high temperature, contracts upto 4°C because volume decreases and expands when cooled further below 4°C and hence density of water increases when it is cooled upto 4°C while decreases when cooled further below 4°C. In other words, the density of water is maximum at 4°C equal to 1 g Cm^-3 or lOOO kg m^-3.

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