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. Pascals (symbol = Pa) or, more commonly, kiloPascals (symbol = kPa).This is an unfortunate situation, but we cannot change it. There are three different units of pressure used in chemistry. Here is a repeat from the 'Four Variables' file: Converting between Units of Pressure: atm, mmHg and kPa Converting between Units of Pressure: atm., mmHg and kPa

Change psi to kpa