Pressure unit used in the international SI system is called a name of the French scientist and writer Blaise Pascal living in the seventeenth century. It is equal to pressure in one Newton distributed on the area of one square meter. Except it pressure is designated also in other units including in the atmospheres. This measure is brought out of practical measurements and is equal to pressure of the terrestrial atmosphere at sea level.
It is required to you
- Calculator or Internet access.
Instruction
1. Begin with specification which of two options of the atmospheres you need to receive as a result of converting of initial size in megapascals. Most often the "standard" or "physical" atmosphere equal to pressure force which can be counterbalanced with a 760-millimeter column of mercury with a density of 13595.1 kg/m means? at the acceleration of gravity equal to 9.80665 m/s?. These are mercury density at 0 °C and Earth attraction force at sea level. But there is also a "technical" atmosphere which is accepted to the equal pressure force of cargo weighing 1 kg on the plane of 1 cm?, located perpendicular to gravity in 1 kgf.
2. Define atmosphere coefficient. You recognize that one standard atmosphere is equated to 101325 Pascale, and to one technical atmosphere there correspond 98066.5 Pascal. Reduction of MPa designates the size, derivative of Pascal, - megapascal. In all units of measure used in the SI system to a prefix mega there corresponds the multiplier equal to one million (10?), so the values given above should be reduced by six orders. Transfer a comma and receive coefficients 0.101325 and 0.0980665.
3. Divide the reference value measured in megapascals into the translation coefficient received on the previous step. As this coefficient - not round figure, it is not really convenient to make calculations in mind. Use for this purpose the calculator and if there is an Internet access, then use the calculators who are built in many search engines. For example, if it is required to transfer to the physical atmospheres pressure size in 78 MPas, then pass to the homepage of Google and in the field of a search query enter 78/0.101325. The search engine will make calculation and will display result: 78 / 0.101325 = 769.800148.