Page 48 - Pressure 10 class

The device which is used to measure atmospheric pressure is

called barometer. The commonly used barometer is Mercury

barometer.

1. At high altitudes, nose bleeding is a common

experiences, why?

Ans; At high altitudes, the atmospheric pressure is lower than the

pressure within our body. This results bursting of the thin

capillaries in the nose and bleeding happens from the nose. So,

at high altitudes, it is a common experience to have nose

bleeding.

2.When a heated can is closed and allowed to cool, it gets

squashed. Why?

Ans; When a can is heated, hot air escape out. When we close the

lid, a vacuum is formed due to low pressure inside it. So, the

atmospheric pressure crushes the can when it is cooled.

July 30, 2020 Taranath Baral/GC Shiba/Suraj Thapaliya 48