The Barometer

What is a barometer?

1 pts

volume_mute

Define a barometer and state its primary function in physics and meteorology.

A device used to measure humidity in the air

A device used to measure atmospheric pressure

A device used to measure wind speed

A device used to measure temperature

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Mercury barometer diagram analysis

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volume_mute

Based on the description of a mercury barometer, what occupies the space at the top of the sealed tube above the mercury column?

Air at atmospheric pressure

Water vapor

A vacuum (very low pressure)

Helium gas

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The height of a mercury column

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volume_mute

At sea level, a mercury barometer typically shows a column height of approximately 30 inches. What is this same height expressed in centimeters?

76 cm

30 cm

100 cm

50 cm

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Why mercury stays up

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volume_mute

In a mercury barometer, what force or phenomenon keeps the mercury from simply draining completely out of the inverted tube?

Surface tension of the mercury

The vacuum at the top sucks the mercury upward

Atmospheric pressure pushing down on the mercury pool below

Magnetic attraction between the mercury and the glass tube

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Pressure equality in a barometer

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volume_mute

It is stated that 'the pressure at point A must equal the pressure at point B because the points are at the same level.' In a mercury barometer, pressure at point A (inside the tube at the level of the mercury pool) equals what?

The pressure inside the vacuum

The weight of the mercury column above point A

Atmospheric pressure outside the tube at the same level

Zero pressure

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Calculating pressure from mercury height

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volume_mute

The density of mercury is 13,600 kg/m³, so its weight density is 133,000 N/m³. Using the formula pressure = depth × weight density, calculate the pressure exerted by a 76 cm (0.76 m) column of mercury. Select the correct value.

1.01 × 10³ N/m²

1.01 × 10⁵ N/m²

1.01 × 10⁷ N/m²

1.01 × 10² N/m²

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Interpreting barometer readings (Drag/Drop inplace)

1 pts

Complete the following sentence by dragging the correct word into the placeholder: A reading of 74 centimeters of mercury indicates (1) atmospheric pressure compared to a reading of 76 centimeters of mercury.

Please drag and drop the selected option in the right place or type it instead

higher

lower

the same

zero

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Sorting the steps of barometer operation

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Please drag and drop the options to sort them

Arrange the following events in the correct order to explain how a mercury barometer works. Place the first event at the top, the last event at the bottom.

Mercury column falls, leaving a vacuum at the top

Atmospheric pressure pushes down on the mercury pool

A long tube is filled with mercury and inverted in a pool of mercury

The pressure of the mercury column's weight balances atmospheric pressure

Mercury rises to a height of about 30 inches

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Weather report interpretation

1 pts

volume_mute

A weather report on TV says, 'The pressure today is 29.8 inches.' Is this statement technically correct? Explain why or why not.

Yes, because inches is the standard unit for pressure

No, because pressure should be measured in pounds per square inch only

Technically no, because it should say the pressure is equal to the pressure exerted by 29.8 inches of mercury

Yes, because all weather reports use inches

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Converting inches of mercury to mm Hg

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volume_mute

A weather map shows a pressure system with a reading of 30 inches of mercury. What is this pressure expressed in millimeters of mercury (mm Hg)? (Note: 1 inch = 25.4 mm)

300 mm Hg

762 mm Hg

30 mm Hg

254 mm Hg

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What height of mercury column corresponds to a pressure of 15 lb/in²?

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volume_mute

A barometer is taken to a location where the atmospheric pressure is measured as 15 lb/in². The weight density of mercury is 0.49 lb/in³. What height of mercury column (in inches) would this atmospheric pressure support? (Use the formula: pressure = depth × weight density)

15.0 inches

30.6 inches

7.35 inches

0.49 inches

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Which description correctly matches an aneroid barometer?

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volume_mute

Which of the following descriptions correctly describes an aneroid barometer?

A long glass tube filled with mercury inverted in a pool of mercury

A device that requires mercury and a vacuum at the top of a glass tube

A compact device with a flexible metal container that expands and contracts with pressure changes

A device that measures pressure by weighing a column of liquid

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Classify the following statements about barometers

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Classify each statement below as either 'True' or 'False.'

drag and drop the selected option to the right place

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If the tube is made longer...

1 pts

volume_mute

In a mercury barometer at sea level, what would happen if you replaced the 1-meter tube with a 2-meter tube (both sealed at the top and inverted into the same mercury pool)?

The mercury would rise to about 2 meters (152 cm)

The mercury would rise to about 76 cm, leaving a longer vacuum at the top

The barometer would stop working entirely

The mercury would overflow out of the tube

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Why the aneroid barometer is popular (Identify Words)

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Click or touch the word(s) you want to choose

volume_mute

Read the following passage and identify the TWO words that describe why aneroid barometers are preferred over mercury barometers for many applications: 'Compact barometers have an airtight container with a flexible end. As atmospheric pressure increases, this flexible end is pushed inward and a lever connected to it moves a pointer on a dial on the face of the barometer. Because of the common use of the mercury barometer, such dials are normally calibrated in inches or centimeters of mercury even though they contain no mercury.'

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What is a barometer?

Correct Answer

Explanation

Mercury barometer diagram analysis

Correct Answer

Explanation

The height of a mercury column

Correct Answer

Explanation

Why mercury stays up

Correct Answer

Explanation

Pressure equality in a barometer

Correct Answer

Explanation

Calculating pressure from mercury height

Correct Answer

Explanation

Interpreting barometer readings (Drag/Drop inplace)

Correct Answer

Explanation

Sorting the steps of barometer operation

Correct Answer

Explanation

Weather report interpretation

Correct Answer

Explanation

Converting inches of mercury to mm Hg

Correct Answer

Explanation

What height of mercury column corresponds to a pressure of 15 lb/in²?

Correct Answer

Explanation

Which description correctly matches an aneroid barometer?

Correct Answer

Explanation

Classify the following statements about barometers

drag and drop the selected option to the right place

Correct Answer

Explanation

If the tube is made longer...

Correct Answer

Explanation

Why the aneroid barometer is popular (Identify Words)

Correct Answer

Explanation

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