Class 7 Exam > Class 7 Videos > Class 7 Oxford Science: Chapter Notes, Worksheets & Tests > Experiment to Understand: Air Exerts Pressure
Experiment to Understand: Air Exerts Pressure Video Lecture | Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
FAQs on Experiment to Understand: Air Exerts Pressure Video Lecture - Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
| 1. What is air pressure? |  |
Ans. Air pressure is the force exerted by the weight of the air molecules in the Earth's atmosphere on any object or surface. It is the force per unit area exerted in all directions, and it decreases as we move higher up in the atmosphere.
| 2. How is air pressure measured? | |
Ans. Air pressure is commonly measured using a device called a barometer. A barometer can be either a mercury barometer or an aneroid barometer. A mercury barometer measures air pressure by the height of a column of mercury in a tube, while an aneroid barometer uses a flexible metal container to measure air pressure.
| 3. Why does air exert pressure? | |
Ans. Air exerts pressure because it consists of countless air molecules that are constantly moving and colliding with each other and with objects in their surroundings. The collisions between the air molecules and surfaces create a force, resulting in air pressure.
| 4. How does air pressure change with altitude? | |
Ans. As we move higher up in the atmosphere, the density of air decreases, which means there are fewer air molecules in a given volume. Therefore, the air pressure also decreases with increasing altitude. This is why we feel changes in air pressure when we travel to higher altitudes or go up in an airplane.
| 5. What are some practical applications of understanding air pressure? | |
Ans. Understanding air pressure is important in various fields. It is crucial in meteorology for weather forecasting, as changes in air pressure can indicate the movement of weather systems. Air pressure is also essential in the functioning of various devices, such as barometers, sphygmomanometers (used to measure blood pressure), and pneumatic systems (used in tools and machinery).
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