Question

1. why do we sweat on humid day?
2. both boiling and evaporation convert liquid into vapours. what is the difference between two processes??
3. how is heating of sugar and heating of Ammonium Chloride different from each other. explain?

Answer 1

.1. Droplets of sweat are extracted through the pores and onto the skin. if the air is dry, the sweat will evaporate quickly. In humid days air has more water vapour then the sweat remains on skin and does not evaporate. So we sweat.
2. Boiling is a bulk phenomenon.
Evaporation is a surface phenomenon.
particles from the bulk of liquid change into vapour state
particles from surface gain enough energy to overcome the forces of attraction present in liquid and change into the vapou state.
3. sorry don't know

Answer 2

1.As the water evaporates, it transfers the body's heat to the air. ... On drydays, sweat evaporates quickly, which means it also carries away heat faster. On humid days, when the air is already saturated with water, sweat evaporates more slowly. This explains why it feels so much hotter in highhumidity.

2.Evaporation usually occurs on the surface. Evaporation may occur when the partial pressure of vapor of a substance is less than the equilibrium vapour pressure. Boiling is a phase transition from the liquid phase to gas phase that occurs at or above theboiling temperature.

3.Heating sugar gives carbon dioxide gas and water molecules. ... Thedifference is, heating of sugar is a chemical change whereas heating of ammonium chloride is a physical as well as chemical change.


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