## How does it measure the pressure of a sample of gas?

The pressure of a gas may be expressed in the SI unit of pascal or kilopascal, as well as in many other units including torr, atmosphere, and bar. Atmospheric pressure is measured using a barometer; other gas pressures can be measured using one of several types of manometers.

**What is the formula of manometer?**

Manometers. One of the most important classes of pressure gauges applies the property that pressure due to the weight of a fluid of constant density is given by p = hρg.

**What is the pressure in the gas chamber of the manometer?**

1.38 bar

Open end mercury manometer is connected to a gas chamber containing gas at a pressure of 1.38 bar.

### What equation represents Charles Law?

Charles Law states that the volume of a given mass of a gas is directly proportional to its Kevin temperature at constant pressure. In mathematical terms, the relationship between temperature and volume is expressed as V1/T1=V2/T2.

**How do you calculate pressure in a cylinder?**

Divide the force by the total surface area to get the system pressure.

- Pressure = Force ÷ Surface Area.
- Pressure = 100 ÷ 7.948.
- Pressure = 12.582. (Rounds to 13 psi)

**How is a manometer used to measure pressure?**

The open-tube manometer is used to measure the pressure of a gas in a container. The pressure of the gas is given by h (the difference in mercury levels) in units of torr or mmHg. Atmospheric pressure pushes on the mercury from one direction, and the gas in the container pushes from the other direction.

## How does manometer measure gas pressure?

A manometer is used to measure the pressure of a gas in a tank. The fluid used has a the specific gravity of 0.85, and the manometer column height is 55 cm, as shown in figure 3-20. If the local atmospheric pressure is 96 kPa, determine the absolute pressure within the tank.

**Why to use a manometer?**

It has good accuracy and sensitivity

**What does a manometer measure, “absolute” or “gauge” pressure?**

A manometer can be designed to directly measure absolute pressure . The manometer in Figure 5 measures the pressure compared to zero absolute pressure in a sealed leg above a mercury column. The most common form of this manometer is the conventional mercury barometer used to measure atmospheric pressure.

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