3. Weather Instruments

Multiple Choice

What happens to the liquid inside a thermometer when it is heated?

• It expands and rises up the glass tube

• It contracts and falls down the glass tube

• It stays the same

• It evaporates completely

Multiple Choice

Which instrument is used to measure air pressure and what units are commonly used?

• Barometer; millibars or inches of mercury

• Anemometer; knots

• Rain Gauge; millimeters

• Thermometer; degrees Celsius

Open Ended

Explain how a mercury barometer works to measure atmospheric pressure.

Multiple Choice

Air pressure is strong enough to crush even metal. What does this demonstrate about the properties of air?

• Air has weight and exerts force

• Air is invisible and cannot affect objects

• Air is lighter than metal

• Air only exists in closed spaces

Open Ended

How does a barometer work?

Multiple Choice

Which of the following instruments are used to measure precipitation?

• Rain Gauge

• Barometer

• Anemometer

• Thermometer

Multiple Choice

Which instrument is used to measure the direction of the wind?

• Wind vane

• Anemometer

• Rain gauge

• Barometer

Multiple Select

Select all the weather variables that can be measured using the instruments shown in images 1 and 2.

• Wind direction

• Relative humidity

• Dew point

• Temperature

Multiple Choice

Which weather instrument measures the percent relative humidity and dew point?

• Sling psychrometer

• Wind vane

• Rain gauge

• Barometer

Multiple Choice

What happens to the liquid in a thermometer when it is heated?

• It expands and rises up the glass tube

• It contracts and falls down the tube

• It stays the same

• It evaporates

Open Ended

Why do you think meteorologists use weather instruments?

Multiple Choice

Which weather variable is measured by this instrument?

• wind speed

• precipitation

• cloud cover

• air pressure