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At sea level the atmospheric pressure is equal to:

At sea level the atmospheric pressure is equal to: Correct Answer Both 1 and 2

CONCEPT:

Atmospheric Pressure:

  • The pressure of the atmosphere at any point is equal to the weight of a column of air of unit cross-sectional area extending from that point to the top of the atmosphere.
  • At sea level the atmospheric pressure is given as,

⇒ Pa = 1.013 × 105 Pa = 1.013 bar

⇒ 1 bar = 105 Pa

EXPLANATION:

  • At sea level, the atmospheric pressure is given as,

⇒ Pa = 1.013 × 105 Pa = 1.013 bar

  • Italian scientist Evangelista Torricelli (1608-1647) devised for the first time a method for measuring atmospheric pressure.
  • A long glass tube closed at one end and filled with mercury is inverted into a trough of mercury as shown in the figure.
  • This device is known as a ‘mercury barometer’.
  • In the experiment, it is found that the mercury column in the barometer has a height of about 76 cm or 760 mm at sea level equivalent to one atmosphere (1 atm). Hence, option 3 is correct.

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