Question 39

A barometer is used to measure atmospheric pressure.

A barometer is the correct instrument for measuring atmospheric pressure, as it is specifically designed to provide readings of the weight of the air above us.

A) Barometer

This option is correct because a barometer is specifically designed to measure atmospheric pressure. It operates based on the principle that changes in atmospheric pressure will cause a change in the height of a column of mercury or a similar substance, allowing for precise measurements.

B) Thermometer

A thermometer is not suitable for measuring atmospheric pressure; it is used to measure temperature instead. While temperature can influence pressure, the thermometer itself does not provide any direct measurement of atmospheric pressure.

C) Anemometer

An anemometer measures wind speed, not atmospheric pressure. It is commonly used in meteorology to assess wind conditions but does not provide information about the pressure of the atmosphere.

D) Hygrometer

A hygrometer is used to measure humidity levels in the air. It does not measure atmospheric pressure and is therefore not relevant to the question regarding pressure measurements.

Conclusion

The barometer is definitively the correct answer as it is the only tool designed specifically for measuring atmospheric pressure. All other options, including the thermometer, anemometer, and hygrometer, serve different purposes and do not provide readings related to atmospheric pressure.