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What is milkweed?
The samovar valve is closed before the manometer in the pressure path on the path so that the pressure is not permanent on the manometer.
Whenever it is necessary to read the pressure on the gauge, they open the valve and the pressure enters the pressure gauge and after reading the pressure, they close the valve again.
Samovar milk is mostly used for water fluid and should not be used for flammable fluids.
Definition of pressurePressure is the force exerted on a unit of surface denoted by the abbreviation p.
This quantity plays a major role in gases because it is one of the characteristic quantities of gas, so most of the laws of pressure are hidden in gases and are used to obtain the equation of state of gas.
The concept of pressure
The effect of force on a surface depends on how the force is applied.
A person wearing studded sneakers. The nails of his shoes sink into the ground while ordinary shoes do not damage the ground.
It is noteworthy that in both cases the force applied to the surface is the same and is the same force as its weight.
The difference between the two is that sneakers exert force on a small area.
Shoe studs do not change the amount of total force, but rather increase the force per unit area. The amount of force per unit area is also called pressure.
In mathematical language, pressure is expressed as follows:
P = F / A where P is the pressure, F is the force and A is the cross section of the force.
Skiers wear ski boots when skiing because it has a larger cross-section and reduces the pressure on the surface.
Due to the very small cross-sectional area of contact with objects (such as the hand), the knife, due to the application of a small amount of force, creates a larger unit surface force (pressure) and causes the cutting of objects.
Unit of pressure
Pressure is expressed in different units. Our standard unit in SI is Pascal, which is equal to (1 Pa = 1N / m2).
One Pascal is equal to the amount of one Newton of force per square meter of body surface area.
The best unit that can be used as a reference for other units is the Atmospher, which is defined as the average air pressure at sea level.
Because Pascals are a small unit of pressure, they usually use kilopascals (kpa), which is equal to 1000 Pascals.
Each barley is approximately equal to 100 kpa. Meteorologists use the millibar unit, which is equal to one tenth of a pascal.
Other units of pressure include religion per square centimeter (dyn / cm2) or torr.
Because the measurement of pressure in a U-shaped tube is determined by measuring the length of the mercury liquid, the unit of centimeter of mercury (cmHg) is also commonly mistaken for the quantity of pressure.
How to measure pressure
Pressure is measured with the help of pressure gauges.
The main barometers that are named according to the mechanism of experts are:
U-shaped tube barometer
McLeod pressure gauge
Mercury barometer
Thermocouple barometer
Acoustic barometer
Capacitive pressure gauge
Gas ideal barometer
The simplest and most famous of these is the U-shaped tube pressure gauge in which some mercury is poured into the U-shaped tube and the amount of ambient pressure difference (air is equal to p0) and the material inside the barometer that puts pressure on the mercury liquid through the difference in height of the mercury liquid column. will be measured.
So this way we can get the real pressure: «P = P0 + ρg (h-h0)
In the latter relation P is the pressure and ρ of the density of matter and P0 is the pressure of the atmosphere, h0 is the height of the liquid column at atmospheric pressure, g is the acceleration of the height of the liquid column at the pressure of matter.