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Science Distinguish Between :

P-1 Heat · Maharashtra Board STD 10 (MSBSHSE - English Medium). 3 questions.

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Question 14 Marks
Humidity and Dew point
Answer
  Humidity Dew point
(i) The dampness or moistness of air due to the presence of water vapour in it is called humidity(i) The temperature at which air becomes saturated with water vapour is called dew point.
(ii)  It is usually measured in terms of relative humidity which is a percentage.(ii)  It is measured in terms of temperature in degree celcius.
(iii) When air is saturated with water vapour, the relative humidity is 100%.(iii) When the temperature falls below the dew point, when relative humidity is 100%, a dew starts forming.
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Question 24 Marks
Absolute Humidity and Relative Humidity
Answer
  Absolute Humidity   Relative Humidity
$(i)$ The mass of water vapour per unit volume of air is called absolute humidity. $(i)$ The ratio of the mass of water vapour in a given volume of air at given temperature to the mass of water vapour required to saturate the same volume of air at the same temperature is called relative humidity.
$(ii)$ It has unit. $(ii)$ It has no unit.
$(iii)$ It is measured in $\ kg/m^3.$ $(iii)$ It is measured in percentage.
$(iv)$ Mass of water vapour present is measured. $(iv)$ Extent of humidity is measured.
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Question 34 Marks
What is the difference between heat and temperature?
Answer
 Heat Temperature
(i) It is a form of energy.(i) It is a measure of degree of hotness or coldness of an object.
(ii) SI unit is joule (J)(ii) SI unit is kelvin (K)
(iii) Two bodies having same quantity of heat can be at different temperatures(iii) two bodies at same temperature can have different quantities of heat.
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