Measuring Atmospheric Pressure

What happens to air pressure as you move upward into the atmosphere?

• increases
• decreases
• stays the same

A device that is used to measure atmospheric pressure is a ___________.

• barometer
• thermometer
• kilometer
• micrometer

Explain what would happen to the column of mercury in the barometer as shown if the atmospheric pressure fell.

• As the pressure falls, the column of mercury will drop lower.
• As the pressure falls, the column of mercury will remain unchanged.
• As the pressure falls, the column of mercury will rise higher.
• As the pressure falls, the density of the mercury will increase.

Pressure is the effect of

• the weight of all the air above pressing down
• water vapor in the atmosphere
• greenhouse gases
• solar radiation

The diagram shows an apparatus set up to measure atmospheric pressure.

Calculate the pressure at point Q.

• 10 cm Hg

• 85 cm cm Hg

• 90 cm Hg

• 15 cm Hg

The diagram shows a set up of apparatus for measuring atmospheric pressure. If the density of mercury is

13,600 kgm^-3, determine the atmospheric pressure as measured by the instrument.

• 100,000 Pa

• 101,000 Pa

• 123,760 Pa

• 103,360 Pa

The barometer shows the reading when the atmospheric pressure is 101,000 Pa. The height of the column of mercury is h. What is the pressure at point X?

• 0 Pa

• 25,250 Pa

• 75,750 Pa

• 101,000 Pa

The figure shows a simple barometer with some air trapped in the tube. Given that atmospheric pressure is 76 cm Hg, find the pressure of the trapped air.

• 21 cm Hg

• 24 cm Hg

• 45 cm Hg

• 55 cm Hg

A barometer is used to determine the pressure of the atmosphere. The barometer shows the pressure on a particular day. If the density of mercury is 13,600 kg m^-3, what is the reading of the barometer?

• 101,000 Pa

• 102,000 Pa

• 10,200 Pa

• 1,020 Pa

The barometer in the diagram shows the measurement of the atmospheric pressure. At sea level, the atmospheric pressure is 76 cm Hg. Why is the reading of this barometer different?

• The barometer is broken

• The barometer is measuring water pressure

• The barometer is below sea level

• The barometer is above sea level