7th Class Science Winds, Storm and Cyclones Atmospheric Pressure

Atmospheric Pressure

Category : 7th Class

*       Atmospheric Pressure

 

Atmospheric pressure is the air pressure on the Earth. Pressure at an unit area of the Earth is measured by the total weight of air above that unit area. The weight of air above the unit area of the Earth depends on the presence of water, gas and dust particles. Air pressure is varied according to the location and time, as the amount of air is varied from time to time. Density of air decreases on increasing height, therefore it causes the decreasing of air pressure.

Due to the absence of life supporting elements, i.e., absence of required oxygen, low air pressure in outer space etc, an astronaut requires oxygen while going in space. The dress, which supports the appropriate atmospheric pressure is provided to the astronauts. Special designed dresses protect them from low air pressure.

 

 

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      Which one of the following devices is used for the measurement of air pressure?

(a) Barometer

(b) Thermometer

(c) Potentiometer

(d) All of these

(e) None of these

 

Answer: (a)

 

 

       Air pressure on the Mount Everest with respect to sea level is?

(a) Greater

(b) Smaller

(c) Equal

(d) All of these

(e) None of these

 

Answer: (b)



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