Account for the following:
Q. Account for the following:
(a) When sugar crystals dissolve in water, the level of water does not rise appreciably.
(b) Doctors advise to put strips of wet cloth on the forehead of a person having high fever.
(c) Naphthalene balls disappear with time without leaving any solid residue.
(d) A wooden table should be called a solid.
(e) Dogs generally hang out their tongue in summer.
Ans. (a) Particles of sugar crystals occupy the space between the particles of water.
(b) The excess heat from the body is taken by large latent heat of vaporisation of water. As a result temperature of body decreases.
(c) Due to sublimation, naphthalene gets converted into vapours.
(d) Because a wooden table has a fixed shape as well as fixed volume and, therefore, it is uncompressible.
(e) Evaporation of saliva causes cooling.
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