6. What are some of the automated IT applications that are a great help to your university in
its day-to-day functioning? Explain.
Answers
Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away.
a) Naphthalene balls disappear with time without leaving any solid.
Naphthalene undergoes sublimation easily, i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, balls keep forming naphthalene vapours that disappear into the air with time without leaving any solid.
(b)We can get the smell of perfume sitting several metres away.
Perfume has a higher degree of vaporization
,and its vapour diffuses into the air easily. Gaseous particles possess high speed and move very rapidly in all directions. When perfume is sprayed, its particles diffuse into the air particles at a high-speed rate and reach our nostrils. This enables us to smell the perfume from a distance.