Physical Quantities and Measurement — PHYSICS STD 8 — Question
ICSE BoardEnglish MediumSTD 8PHYSICSPhysical Quantities and Measurement3 Marks
Question
How does the density of a liquid $($or gas$)$ vary with temperature ?
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Answer
Most of the liquids increase in volume with an increase in temperature, but water shows anomalous behaviour. Water has a maximum volume at $4^{\circ} C$ and maximum density at $4^{\circ} C$.
Actually, when volume increases density decreases and when volume decreases the density increases. But water when cooled from high-temperature contracts up to $4^{\circ} C$ because volume decreases and expands when cooled further below $4^{\circ} C$ and hence the density of water increases when it is cooled up to $4^{\circ} C$ while decreases when cooled further below $4^{\circ} C$. In other words, the density of water is maximum at $4^{\circ} C$ equal to $1\ g /Cm ^{-3}$ or $1000\ \ kg/ m ^{-3}$.
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