Give reason for the following a) thermometer reading remain constant for a while during melting of a solid even though we continue to heat the solid. b)we are able to sip hot tea faster from a saucer rather than a cup. c)eathern pitches are used to cool water.
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Ans a) it is due to the hidden heat required to convert solid into liquid. It is also called as LATENT HEAT OF FUSION.
Ans b) It is due to evaporation because evaporation causes cooling and it also depends upon surface area. larger the surface area the more is evaporation. The saucer has larger area than the cup and evaporation is more in saucer. Hence we are able to sip hot tea faster from a saucer than a cup.
Ans c) it has several pores in it so the evaporation is more because water seeps out through the pores present on it.
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Ans b) It is due to evaporation because evaporation causes cooling and it also depends upon surface area. larger the surface area the more is evaporation. The saucer has larger area than the cup and evaporation is more in saucer. Hence we are able to sip hot tea faster from a saucer than a cup.
Ans c) it has several pores in it so the evaporation is more because water seeps out through the pores present on it.
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