Question

Q.give reason for the followings
a) food cooks faster in pressure cooker.
b) Fish and meal can be preserved for a longer time in ice if common salt is added to it. Give reason
c) Air in coastal area has high density​

Answer 1

Explanation:

a) foodcooks faster in pressure cooker because the pressure increases and thereby increasing solublity and further promoting increase of boiling point in turn resulting faster cooking.

B. Common salt increases the freezing point of water and makes remain as ice even at temperatures to a certain limit.

C. Area coastal area are laiden with moisture and water therefore they possess high density

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Answer 2

Explanation:

1. because of high temperature the food cook fast also heat energy are not lost since it is Tightly packed as compared to simple utensil
2. ice provide a resistance to microorganism that take most of the bacteria away for large time and salt is known to a good preservative.
3. In coastal area there is mainly high temperature,water continues evaporated hence increasing the amount of water in air this increase the density in air near coastal area