A student is asked to discuss how thermal expansion influences the density of liquids
PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A student is asked to discuss how thermal expansion influences the density of liquids.
(i) Define density and explain qualitatively how a change in volume produced by heating affects the density of an ordinary liquid whose mass remains constant.
(ii) Water behaves differently from most liquids in the temperature range 0∘C to 4∘C. Describe this anomalous behaviour in terms of both volume change and density change.
(iii) Sketch a qualitative graph (no scale needed) showing the variation of density of water with temperature from 0∘C to 10∘C, indicating the temperature at which the density is maximum.
(iv) Using your explanation in part (ii), state why aquatic organisms are able to survive in a lake even when the surface is frozen in winter.