# What instrument is normally used to measure atmospheric pressure

## 9.1 Gas Pressure

A barometer is normally used to measure atmospheric pressure. A barometer is a thin glass tube that is put upside down in liquid mercury. The weight See full.

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Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects Figure 1. Although the force of each collision is very small, any surface of appreciable area experiences a large number of collisions in a short time, which can result in a high pressure. In fact, normal air pressure is strong enough to crush a metal container when not balanced by equal pressure from inside the container. A dramatic illustration of atmospheric pressure is provided in this brief video, which shows a railway tanker car imploding when its internal pressure is decreased. A smaller scale demonstration of this phenomenon is briefly explained. Atmospheric pressure is caused by the weight of the column of air molecules in the atmosphere above an object, such as the tanker car.

The atoms and molecules that make up the various layers in the atmosphere are constantly moving in random directions. Despite their tiny size, when they strike a surface they exert a force on that surface in what we observe as pressure. Each molecule is too small to feel and only exerts a tiny bit of force. However, when we sum the total forces from the large number of molecules that strike a surface each moment, then the total observed pressure can be considerable. Air pressure can be increased or decreased one of two ways. First, simply adding molecules to any particular container will increase the pressure.

Pressure measurement is the analysis of an applied force by a fluid liquid or gas on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges. A manometer is a good example, as it uses the surface area and weight of a column of liquid to both measure and indicate pressure.

## Barometers

Barometer , device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level , a barometer can also be used to measure altitude. There are two main types of barometers: mercury and aneroid.

## What instrument is normally used to measure atmospheric pressure?

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Storm Glass A storm glass is a type of barometer used centuries ago. A storm glass is a sealed glass container with an open spout, partly filled with colored water. If the water level in the spout rises above the water level in the container, observers expect low pressure and stormy weather. Also called standard atmospheric pressure. Low-pressure systems are often associated with storms. Sea level is determined by measurements taken over a year cycle.

We do not sell Stevenson Screens; this is for customer information only. A Stevenson Screen is a white boxed shelter that contains temperature and relative humidity equipment.

Last updated: July 31, I s it going to rain today? Is it going to stay fine? And how can you tell? One easy way is to measure the air pressure.

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