Q.2 Why do we feel cool when we touch a piece of ice?
Ans. We feel cool because the temperature of ice is 0 deg C and our body’s temp is higher than 0 deg C.
Q.3 Convert the following:- (a) 573 K (b) 36 deg C (c) 373 deg C
b) 36 deg C = 273+36 = 309 K
c) 373 deg C = 373+273= 646 K
measure temperature to any extent.
Ans. When we put some acetone on our hand , after sometime we will feel coolness on our hand because the action absorbs kinetic energy from our hand & evaporates and evaporation causes cooling.
Ans. The significance of boiling point and melting point is that it shows the purity of the substance.
Ans. Particles of matter are constantly moving.
Ans. K= Deg C + 273 = 78 + 273 = 351 K
Ans. – 273 deg C
Ans. The latent heat of fusion (or melting) of a solid is the quanity of heat in joules required to convert 1 kilogram of the solid (at its melting point ) to liquid, without any change in temperature.