Instruction

1

Pascal is unit of pressure SI. Pascal has the dimension kg/MS2. 1 Pascal is the pressure exerted by a force of 1 Newton on a 1 m2 area.

2

1 mm Hg is a non-system unit of pressure it applies to pressure of gases: the atmosphere, water vapor, vacuum. The name describes the physical essence of this unit: the pressure on the base of the mercury column of 1 mm height. In a precise physical definition of a unit includes also the density of mercury and gravitational acceleration.

3

1 mmHg = 133,322 N/m2 or 133 PA. Thus, if we speak about the pressure of 760 mmHg, the PA will receive the following: 760*133,322 = 101325 PA, or about 101 kPa.

Note

Atmospheric pressure is measured with a barometer, in which just there is a column of mercury.

In addition to these two units there are other units such as bars, atmospheres, mm of water column, etc.

1 millimeter of mercury is also called Torr.

In addition to these two units there are other units such as bars, atmospheres, mm of water column, etc.

1 millimeter of mercury is also called Torr.

# Advice 2: How to convert pressure in Pascal

**Pressure**is a physical quantity that shows what force is acting on a particular surface. Body, the substances which are in different aggregate States (solid, liquid and gaseous), pressure in completely different ways. For example, if in Bank to put a piece of cheese, he will put pressure only on the bottom of the jar, and full of the milk, acts with a force on the bottom and sides of the vessel. In the international system of measurement the pressure is measured in Pascals. But there are other units of measurement: millimeters of mercury, Newtons divided by the kilograms, kilo

**Pascals**, hecto

**Pascals**, etc. the Relationship between these variables is established mathematically.

Instruction

1

The unit of pressure Pascal is named after the French scientist Blaise Pascal. It is denoted: PA. When solving problems and practice applicable values with a multiple or decimal fraction of the metric prefixes. For example, kilo

**Pascals**, hecto**Pascals**, Milli**Pascals**, mega**Pascals**, etc. To turn these values to**Pascals**, you must know the mathematical meaning of the prefix. All the available consoles can be found in any physical directory. Example1. 1 kPa=1000Па (one kilopascal is one thousand Pascals). 1 hPa=100nA (one hectopascal is one hundred Pascals). 1MPa= 0.001 PA (one millipascal equals zero point one-thousandth share of Pascal).2

**Pressure**of solids is generally measured in Pascals. But what is physically equal to one Pascal? Based on the determined pressure, calculate the formula for its calculation and displays the unit of measure.

**Pressure**is equal to the ratio of the force perpendicular to the current bearing to the surface area of this support. p=F/S, where p is the pressure, measured in Pascals, F is the force, measured in Newtons, S is the surface area, measured in square meters. It turns out that 1 PA=1N/(m) squared. Example 2. 56 N/(m) squared =56 PA.

3

**The pressure**of the air shell of the Earth is called atmospheric pressure and to measure it in Pascals, and millimeters of mercury (hereafter " mm Hg. calendar). In 1643 an Italian scientist Torricelli was offered the experience of pressure measurement, which used a glass tube with mercury (hence the "mercury column"). It was measured that the normal pressure of the atmosphere is equal to 760 mm Hg. article that is numerically equal to 101325 Pascals. Then, 1 mm Hg.St. ~ A cash consideration of 133,3 PA. To convert millimeters of mercury to

**Pascals**, multiply this value is 133.3. Example 3. 780 mm Hg. article = 780*cash consideration of 133,3 = 103974 PA ~ 104кПа.