Measuring Pressure With Barometers and Manometers

The video tutorial explains the concept of air pressure, how it is measured using barometers and manometers, and the principles behind these devices. It covers the composition of air, the concept of atmospheric pressure, and how it decreases with altitude. The tutorial details the use of mercury in barometers to measure atmospheric pressure and introduces manometers for measuring gas pressure in closed and open systems. Practical applications of these measurements in chemical reactions are also discussed.

What happens to atmospheric pressure as altitude increases?

• It fluctuates randomly.

• It remains constant.

• It decreases.

• It increases.

Why is mercury used in barometers instead of water?

• Mercury is cheaper than water.

• Mercury is more dense than water, requiring a shorter column.

• Mercury is less dense than water.

• Mercury is more volatile than water.

What is hydrostatic pressure?

• Pressure exerted by solids.

• Pressure exerted by the atmosphere.

• Pressure exerted by a fluid due to gravity.

• Pressure exerted by a gas in a container.

How is atmospheric pressure related to hydrostatic pressure in a barometer?

• They are unrelated.

• Hydrostatic pressure is always greater than atmospheric pressure.

• Atmospheric pressure equals hydrostatic pressure to support the fluid column.

• Atmospheric pressure is always greater than hydrostatic pressure.

What is a manometer used for?

• Measuring humidity.

• Measuring temperature.

• Measuring the pressure of a gas in a container.

• Measuring atmospheric pressure.

In a closed-end manometer, what does the height difference between the two arms indicate?

• The pressure of the gas.

• The temperature of the gas.

• The volume of the gas.

• The density of the gas.

In an open-end manometer, if the mercury is higher on the side open to the atmosphere, what does this indicate?

• The gas pressure is equal to atmospheric pressure.

• The gas pressure is higher than atmospheric pressure.

• The gas pressure is lower than atmospheric pressure.

• The gas is not exerting any pressure.