The mercury level decreases in the barometer as the altitude increases. Why?
1 Answer
The barometer is used to measure the atmospheric pressure of a certain place on the earth's surface. As the altitude increases, the atmospheric pressure decreases. So, the level of mercury decreases in the barometer.
Things to remember from Pressure
- The force acting perpendicularly on per unit surface area is called pressure. Its SI unit is N/m2 or Pascal.
- The pressure exerted by the atmosphere is called atmospheric pressure.
- The normal atmospheric pressure i.e. atmospheric pressure at the sea level is 760 mm of Hg.
- Air has weight and it can be easily be compressed.
- Air occupies space.
- Atmospheric pressure decreases with the increase in altitude.
- The pressure exerted by the liquid is called the liquid pressure.
- Liquid exerts pressure at the bottom of the vessel as well as on the sides of the vessel in which it is kept.
- Liquid pressure increases with the increase in depth.
- Liquid exerts pressure equally in all directions.
- When the pressure is applied to an enclosed liquid, then it transmits pressure equally in all directions. This is called Pascal's law.
- Liquid pressure increases with the increase in the density of the liquids.
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