Question

The atmospheric pressure at _______ is 100000 pascal.

• A. $10.34m$
• B. Torricellian
• C. sea level
• D. none

Answer 1

The correct option is C

sea level

Explanation for the correct answer:

Atmospheric pressure:

1. The air around us has some weight, and it tries to press against everything it touches.
2. This pressure is called atmospheric pressure.
3. It is the force exerted on a surface by the air above the surface as gravity pulls it to earth.
4. This pressure is generally measured with a barometer.
5. The bubbles of soap are spherical in shape because the air pressure inside the bubble is exactly equal to the atmospheric pressure.
6. Similarly, the balloon has some expansion as we fill air into it. The air pressure within the balloon is equal to the atmospheric pressure.
7. Thus, the atmospheric pressure at sea level is $100000$ pascal.
8. At sea level, we assume the standard temperature as $15°C$.
9. At sea level, the standard air density is $1.2256\raisebox{1ex}{$kg$}\!\left/ \!\raisebox{-1ex}{$m^3$}\right.$.
10. Thus, the correct option is option C.

Explanation for the incorrect answers:

In the case of option A.

1. At $10.34m$, Pressure will be slightly less than the atmospheric pressure.
2. As Pressure$\propto$1/ altitude. It decreases with an increase in altitude.
3. Thus, option A is incorrect.

In the case of option B.

1. The pressure inside the Torricellian vacuum is the vapor pressure of mercury, about ${10}^{-3}torr$.
2. One torr is equal to $133.32$ pascals.
3. Thus, option B is incorrect.

In the case of option D.

Option D is an absurd option as option C is the correct option.

Thus, the correct option is option C.