What does a mercury manometer measure?
What does a mercury manometer measure?
The most common form of a sealed-tube manometer is the conventional mercury barometer used to measure atmospheric 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.
How do you read a manual manometer?
Use the standard formula p = d * h * 9.8 where “p” is the pressure in pascals, “d” is the density of the liquid in the tube in kilograms per cubic meter, “h” is the doubled height difference in meters from step 1 and 9.8 is the downward force of gravity, 9.8 meters per second squared.
What are the units for pressure?
The basic unit of pressure is the pascal, defined as the pressure exerted by a force of one newton perpendicularly upon an area of one square metre. In North America, however, the US Customary System is preferred. This is based on Imperial units such as the pound (lb) and inch (in) or foot (ft).
What is the pressure of mercury?
The pressure of Mercury’s atmosphere was determined to be about 10−12 bar (compared to the 1 bar atmospheric pressure at sea level on Earth).
How do we measure the flow rate of liquid?
A pitot tube is used to measure fluid flow velocity. The tube is pointed into the flow and the difference between the stagnation pressure at the tip of the probe and the static pressure at its side is measured, yielding the dynamic pressure from which the fluid velocity is calculated using Bernoulli’s equation.
What does the height difference indicate in manometer?
The difference in height, “h,” which is the sum of the readings above and below zero, indicates the amount of vacuum. Instruments employing this principle are called manometers.
How do you read a manometer on a slack tube?
Connect the manometer to the source of pressure, vacuum or differential pressure. When the pressure is imposed add the number of inches one column travels up to the amount the other column travels down to obtain the pressure reading. If the reading is desired in other units the conversion chart may be used.
What are the 3 units of pressure?
Final Thoughts
Unit | Symbol | Atmospheric Pressure |
---|---|---|
Pascal | Pa | 101,325 |
Atmosphere | atm | 1 |
torr | Torr | 760 |
bar | bar | 1.013 |