Question

4. Air is made up of gas particles. These particles exert pressure on every object they collide against. This pressure is known as air pressure. Which of the following statements about air pressure is true?
Air pressure decreases as altitude increases


The atmosphere's air pressure does not vary


WArm air tends to have a higher air pressure than cold air


Air pressure increases as altitude increases

Answer 1

Answer: Air Pressure decreases as altitude increases.

Explanation: The pressure in the atmosphere at any level can be termed as the total weight of the air at level.

The pressure at lower levels is higher than the pressure at elevated distances because the air molecules are stick to the surface of the earth due to the gravitational pull.

Thus at higher altitudes, due to decrease of the atmospheric air, pressure also decreases.

Answer 2

Air pressure increases as altitude decreases.