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Explain Why Atmospheric Pressure at a Height of About 6 Km Decreases to Nearly Half of Its Value at the Sea Level, Though the Height of the Atmosphere is More than 100 Km - CBSE (Science) Class 11 - Physics

ConceptPressure Concept of Pressure

Question

Explain why Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km

Solution 1

A density of air is the maximum near the sea level. The density of air decreases with increase in height from the surface. At a height of about 6 km, density decreases to nearly half of its value at the sea level. Atmospheric pressure is proportional to density. Hence, at a height of 6 km from the surface, it decreases to nearly half of its value at the sea level.

Solution 2

The variation of air-density with height is not linear. So, pressure also does not reduce linearly with height. The air pressure at a height h is given by P = P0eαh where P0 represents the pressure of air at sea-level and α is a constant.

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APPEARS IN

NCERT Solution for Physics Textbook for Class 11 (2018 to Current)
Chapter 10: Mechanical Properties of Fluids
Q: 1.2 | Page no. 268
Solution Explain Why Atmospheric Pressure at a Height of About 6 Km Decreases to Nearly Half of Its Value at the Sea Level, Though the Height of the Atmosphere is More than 100 Km Concept: Pressure - Concept of Pressure.
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