# What are the two instruments used to measure atmospheric pressure?

## What are the two instruments used to measure atmospheric pressure?

A barometer is the most common instrument used to measure air pressure, and it comes in two forms: aneroid and mercury.

### How do you measure air pressure?

Atmospheric pressure is the pressure caused by the mass of our gaseous atmosphere. It can be measured using mercury in the equation atmospheric pressure = density of mercury x acceleration due to gravity x height of column of mercury.

Which is the most convenient instrument used to measure atmospheric pressure?

Answer: To measure atmospheric pressure, an BAROMETER.

How does a barometer measure pressure?

The barometer works by balancing the weight of mercury in the glass tube against the atmospheric pressure, much like a set of scales. If the weight of mercury is less than the atmospheric pressure, the mercury level in the glass tube rises (high pressure).

## What are the two types of pressure?

There are two basic pressure types: absolute and gauge, distinguished by what pressure they are compared to, which is called the reference pressure. Gauge pressure’s reference is ambient atmospheric pressure. Absolute pressure’s reference is an absolute vacuum.

### Which instrument is used to humidity?

Hygrometer
Hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air.

Is used to measure pressure in the air?

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.

Which instrument is used to measure?

Tools used to measure length include a ruler, a Vernier caliper, and a micrometer screw gauge. To measure the diameter of objects, like pipe and wire, a vernier caliper and a micrometer screw gauge can be used.

## What is barometer with diagram?

Simple barometer An inverted glass tube is standing in the bath of mercury and air pressure is exerted on the surface of mercury. The pressure at the top of the mercury column is zero as there is a vacuum there.

### What is the basic principle of barometer?

A barometer is essentially a balance. The weight of the atmosphere is balanced by the weight of a much shorter mercury column. You can’t use an ordinary pan balance to weight the atmosphere (because air is pushing down on both sides).

What are the 4 types of pressure?

The different types of pressure are differentiated only by the reference pressure.

• Absolute pressure. The clearest reference pressure is the pressure zero, which exists in the air-free space of the universe.
• Atmospheric pressure.
• Differential pressure.
• Overpressure (gauge pressure)