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With reference to the Pressure, consider the following statements: 1. A column of air exerts weight in terms of pressure on the surface of the earth. 2. The weight of the column of air at a given place and time is called air pressure or atmospheric pressure. 3. Atmospheric pressure is measured as force per unit area. Which of the following statement given above is/are correct?

With reference to the Pressure, consider the following statements: 1. A column of air exerts weight in terms of pressure on the surface of the earth. 2. The weight of the column of air at a given place and time is called air pressure or atmospheric pressure. 3. Atmospheric pressure is measured as force per unit area. Which of the following statement given above is/are correct? Correct Answer 1, 2, and 3

The correct answer is 1, 2, and 3.

Key Points

  • Pressure
    • A 
    • The weight of the column of air at a given place and time is called air pressure or atmospheric pressure. Hence, statement 2 is correct.
    • Atmospheric pressure is measured by an instrument called a barometer. Hence, statement 3 is correct.
    • Atmospheric pressure is measured as force per unit area. The unit used for measuring pressure is called millibar. 
    • One millibar is equal to the force of nearly one gram per square centimetre.
    • Factors Controlling Pressure Systems
    • There are two main causes, thermal and dynamic, for the pressure differences resulting in high and low-pressure systems.
    • Thermal Factors 
      • When air is heated, it expands and, hence, its density decreases. This naturally leads to low pressure. On the contrary, cooling results in contraction. This increases the density and thus leads to high pressure.
      • The formation of equatorial low and polar highs are examples of thermal lows and thermal highs, respectively.
    • Dynamic Factors
      • Apart from variations of temperature, the formation of pressure belts may be explained by dynamic controls arising out of pressure gradient forces and rotation of the earth (Coriolis force).

Related Questions

Consider the following statements.
1. SI unit of atmospheric pressure is Nm-2 or pascal and CGS unit is dyne/cm2.
2. The barometer is a device by which the atmospheric pressure is measured.
3. The standard atmospheric pressure is the pressure required of 76 cm of Hg column or 760 mm of Hg column, which is equivalent to 1 atm.
Which of the statements given above is/are correct?
With reference to the Air pressure, consider the following statements: 1. The weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere is called the atmospheric pressure. 2. In the lower atmosphere, the pressure increases rapidly with height. 3. The horizontal pressure gradient force is much larger than that of the vertical pressure gradient. Which of the above statement is/are correct?
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