Express this pressure in atmospheres, kilopascals, torrs, pounds per square inch, and pascals. 101.325 kPa = 101,325 Pa.Įxample #12: A student reads a barometer in the laboratory and finds the prevailing atmospheric pressure to be 720.0 mmHg. KPa (kilopascals) is the more commonly used unit, but Pa is used from time to time. Don't tell 'em some guy on the Internet (me!) said they were wrong. If your instructor insists in using Torr, just follow his/her practice. By the way, it is a lowercase t, not a capital, as in Torr. It was intended as a replacement for mmHg, however, mmHg did not fade away. Notice that the kPa will cancel, since one is in the numerator and one is in the denominator, leaving mmHg as the unit on the answer. Notice that the mmHg will cancel, since one is in the numerator and one is in the denominator, leaving kPa as the unit on the answer. In this conversion, both 760.0 and 101.325 will be involved and the location of each (numerator or denominator) will depend on the conversion. The 1 was assumed to be present.īy the way, the 1 (as in 1 atm) has no influence on significant figures. For example, 760.0 mmHg / 1 atm in examples 1 and 2. The conversion examples above are examples of a one being involved.
This situation is slighly unusual because most conversions involve a one, usually in the denominator. Converting between millimeters of mercury and kilopascals.ħ60.0 mmHg equals 101.325 kPa, so both values will be involved. The answer is rounded to four significant figures. Notice that the kPa values cancel and the atm, in the denominator of the denominator, moves to the numerator. Solution: divide the kPa value by 101.325 kPa / atm. In that case, think of the 1 as being understood to be there.
Sometimes the 1 in front of atm is eliminated. Notice that the atm values( one in the numerator and one in the denominator) cancel, leaving kPa. Solution: multiply the atm value by 101.325 kPa / atm. One atm equals 101.325 kPa, so there will be a multiplication or division based on the direction of the change. Converting between atmospheres and kilopascals. Note also that the answer of 0.980 atm has been rounded off to three significant figures. Notice that the mmHg values cancel and the atm, in the denominator of the denominator, moves to the numerator. Solution: divide the mmHg value by 760.0 mmHg / atm Notice that the atm values (one in the numerator and one in the denominator) cancel, leaving mmHg. Solution: multiply the atm value by 760.0 mmHg / atm. equals 760.0 mm Hg, so there will be a multiplication or division based on the direction of the change. Converting between atmospheres and millimeters of mercury.
Here is a repeat from the "Four Variables" file: The atmospheric pressure at sea level is 14.7 psi.Converting between Units of Pressure: atm, mmHg and kPa Converting between Units of Pressure: atm., mmHg and kPa Atmospheric pressure is also often stated as pounds/square inch (psi). Standard atmospheric pressure is called 1 atm of pressure and is equal to 760 mmHg and 101.3 kPa. Another commonly used unit of pressure is the atmosphere (atm). A pascal is a very small amount of pressure, so the more useful unit for everyday gas pressures is the kilopascal (kPa). The pascal (Pa) is the standard unit of pressure. An equivalent unit to the mmHg is called the torr, in honor of the inventor of the barometer, Evangelista Torricelli. One unit of gas pressure is the millimeter of mercury (mmHg). Tire pressure is best measured when the tire is cold since driving the car for a while will heat up the air in the tire and increase the pressure.Ī barometer measures gas pressure by the height of the column of mercury. The pressure on the tire is the maximum pressure for that tire, not the recommended one.
#743 mmhg to atm manual
The recommended pressure for that model of car (usually somewhere between 32-35 psi) is usually listed in the owner’s manual or stamped somewhere inside the door. The car gets better gas mileage and the tires don’t wear out as fast. The ride is smoother and safer than with lowered pressure. There are several benefits to maintaining the proper air pressure in a car tire.
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