The numerical value of the pressure given in mm of mercury column, for the expression in the multiply by 101325 Pascals and divide by 760, as according to tabular data 1 mm Hg. article = 101325/760 PA. The formula for conversion of units of measure is:RP=RM*101325/760,germ – pressure expressed in millimeters of mercury column,RP is the pressure expressed in Pascals.
It is not always necessary to use the exact formula given in the first paragraph. In practice use a more simple formula:RP=RM*133,322 or even RP=RM*133 in cases where the accuracy of the result must be sign units.
In Russia, the common unit is the millimeter of mercury column. Often, however, when reporting measurement results omit part names of units, to the extent that blood pressure just Express a numerical relation, for example, 120 over 80. This can be observed in meteorological reports, and in the production process engineers vacuumseal. The physical vacuum has very low pressure, which is measured for convenience in microns of mercury column. Micron is a thousand times less than a millimeter. In all cases, if it is not possible to specify data, use the above formula to transfer the pressure from mm of the mercury column to Pascals.
For measuring high pressures traditionally used a unit called "atmospheresand", which is equivalent to normal atmospheric pressure. In numerical expression 1 ATM = 760 mm Hg. article From this relation by simple insights it is possible to obtain the dependence of atmospheres from Pascals: RP = RA*101325, where RA is the pressure expressed in atmospheres. For practical calculations use the formula: RP = RA * 10000.
If the pressure is given in atmospheres, technical, translation in mm of the mercury column , its value should be multiplied by 735,56.
If you have a computer or phone with Internet access use any online service for converting units of measurement of physical quantities.
Advice 2: How to convert MPa to atmosphere
The name of the French scientist and writer Blaise Pascal, who lived in the seventeenth century, called the unit of pressure used in the international system SI. It is equal to the pressure of one Newton distributed on an area of one square meter. In addition to her pressure and indicate to other units, including in the atmospheres. This measure is derived from practical measurements and is equal to the pressure of the earth's atmosphere at sea level.
You will need
- A calculator or Internet access.
Start with the clarification that it is because of two variants of atmospheres you need to as a result of converting the initial value in megapascal. Most often refers to the "standard" or "physical" atmosphere equal to the pressure force which can be balanced by 760-millimeter column of mercury 13595,1 density in kg/m? when the acceleration of gravity, equal to 9,80665 m/s?. These are the density of mercury at 0°C and the Earth's gravity at sea level. But there is also "technical" atmosphere, which is taken equal to the pressure force of the load mass 1kg on a plane area of 1 cm?, perpendicular to gravity in 1Kgs.
To determine the rate of the transfer values from the MPa in the atmosphere. Assume that one standard atmosphere is equal to 101325 Pascal, and one technical atmosphere corresponds to 98066,5 Pascal. The reduction in MPa is indicated by the derivative of the value of Pascal - megapascal. All used SI units prefix mega corresponds to a factor of one million (10?), so the above values should be reduced by six orders of magnitude. Move the comma and get the coefficients 0,101325 and 0,0980665.
Divide the measured value in megapascal, the conversion factor obtained in the previous step. Since this ratio is not a round figure, calculate in the mind not very convenient. To do this, use a calculator, but if you have access to the Internet, use the computers embedded to many search engines. For example, if you want to translate in the physical atmosphere the pressure is 78 MPa, then go to the home page of Google and in the search query box enter 78/0,101325. The search engine will calculate and display the result: 78 / 0,101325 = 769,800148.