Give reasons for the following (a) For any physical state of a substance, the temperature remains constant during its change of state. (b) The level of water in a glass does not change when salt is dissolved in it. (c) During summer, sitting under the fan makes us comfortable. (d) Water droplets appear on the outer surface of a tumbler containing ice cold water. (e) The rate of diffusion of gases is faster in gases (f) Wet clothes dry slowly in rainy season. (g) People prefer to wear cotton clothes in summer. (h) On a hot sunny day people sprinkle water on the roof or open gr
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a)Because the energy is used in changing the state of the matter.
b)because of particles of matter have space between them
c)because in summer season we perspire more. so the air absorbs the vapours Nd causes cooling.
d)the water vapour present in air on coming on contact with the cold glass of water loses energy and gets converted to liquid state.
e)due to high speed of particles and large space between them.
f)because the amount of water in air is already high during monsoon. so the rate of evaporation decreases.
g)The heat energy equals to the latent heat of vaporisation is absorbed from the body leaving the body cool. cotton being a good absorber of water HELPS in absorbing the sweat and exposing it to the atmosphere for easy vaporisation.
h)because the latent heat of vaporisation of water HELPS to cool the hot surface.
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b)because of particles of matter have space between them
c)because in summer season we perspire more. so the air absorbs the vapours Nd causes cooling.
d)the water vapour present in air on coming on contact with the cold glass of water loses energy and gets converted to liquid state.
e)due to high speed of particles and large space between them.
f)because the amount of water in air is already high during monsoon. so the rate of evaporation decreases.
g)The heat energy equals to the latent heat of vaporisation is absorbed from the body leaving the body cool. cotton being a good absorber of water HELPS in absorbing the sweat and exposing it to the atmosphere for easy vaporisation.
h)because the latent heat of vaporisation of water HELPS to cool the hot surface.
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a)the heat supplied is used up in changing the state by breaking the intermolecular forces of attraction which hole them in solid state .as a result there is no change in temperature till the ice melts .
b)the level of water does not change when salt is dissolved in it because the water particles have spaces between them .the salt particles get into the spaces of the water particles.as a result the water taste become salty.
c )
it is because we perspire more in the summer days ,the sweat of our body evaporate by taking the latent heat of vaporisation from our body and the fan increased the rate of evaporation.
d)if we place some ice cold water in a dry glass we can see tiny water droplets on the outer surface of the glass it is because water vapour present in the air touches the cold surface of the glass .they condenses to form tiny droplets liquid water .
e)it is because the particles of gases are loosely packed and the forces of attraction are negligible small so they can move in all directions because the kinetic energy is high so they can diffuse easily .
f)because the humidity is high so the rate of evaporation is less.
g)on hot summer days people perspire more because the temperature tends to rise too much the sweat evaporate by taking the latent heat of vaporization from our body this keeps our body cool and Cotton is a good absorber of water so it absorbs the sweat and exposes it to air for evaporation.
h) it is because the water evaporates by taking large latent heat of vaporisation from the ground and surrounding air and makes the place cold .
b)the level of water does not change when salt is dissolved in it because the water particles have spaces between them .the salt particles get into the spaces of the water particles.as a result the water taste become salty.
c )
it is because we perspire more in the summer days ,the sweat of our body evaporate by taking the latent heat of vaporisation from our body and the fan increased the rate of evaporation.
d)if we place some ice cold water in a dry glass we can see tiny water droplets on the outer surface of the glass it is because water vapour present in the air touches the cold surface of the glass .they condenses to form tiny droplets liquid water .
e)it is because the particles of gases are loosely packed and the forces of attraction are negligible small so they can move in all directions because the kinetic energy is high so they can diffuse easily .
f)because the humidity is high so the rate of evaporation is less.
g)on hot summer days people perspire more because the temperature tends to rise too much the sweat evaporate by taking the latent heat of vaporization from our body this keeps our body cool and Cotton is a good absorber of water so it absorbs the sweat and exposes it to air for evaporation.
h) it is because the water evaporates by taking large latent heat of vaporisation from the ground and surrounding air and makes the place cold .
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