Question

Give reasons
i) Evaporation of sweat causes cooling.
ii) Ventilators are provided near the ceiling of a room.
11) Clinical thermometers have a kink in the capillary tube​

Answer 1

(1) because the heat energy is absorbed by surrounding particles.

(2)In the room when air is hot its density decrease and rises up. So ventilators help to remove out hot air from the room and make its temperature same.

(3)kink prevents the mercury present in the capillary to fall back in the bulb. So it separates the mercury at high temperature and cool mercury and allows the user to note the reading when the thermometer is taken out.