Abrasion Physical wearing and grinding of a surface through friction and impact by material carried in air, water, or ice. Absolute Humidity Measurement of atmospheric humidity. Absolute humidity is the mass of water vapor in a given volume of air this measurement is not influenced by the mass of the air. Normally expressed in grams of water vapor per cubic meter of atmosphere at a specific temperature.
Pressure Unit Conversions Definition Pressure is a measure of the force against a surface. Pressure is usually expressed as a force per unit area. Here is a handy conversion calculator for some common pressure terms. The definitions of each term are in the following section. Pressure Conversion Calculator Enter number on the left side; answer appears on the right side This many: These witty workplace labels from Safety Emporium are a fun way to relieve workplace pressures.
The metric system has been adopted by almost every country except Atmospheric pressure United States. Even in the U. If you are unfamiliar with the terms used in these definitions, see our mass unit and distance unit conversion pages. Normal atmospheric pressure is Atmosphere Normal atmospheric pressure is defined as 1 atmosphere.
Torr torr Based on the original Torricelli barometer design, one atmosphere of pressure will force the column of mercury Hg in a mercury barometer to a height of millimeters. A pressure that causes the Hg column to rise 1 millimeter is called a torr you may still see the term 1 mm Hg used; this has been replaced by the torr.
Bar bar The bar nearly identical to the atmosphere unit. Millibar mb or mbar There are 1, millibar in one bar. This unit is used by meteorologists who find it easier to refer to atmospheric pressures without using decimals.
Pressures of several gigapascals can convert graphite to diamond or make hydrogen a metallic conductor! Such high pressures are rarely encountered in everyday life. If you ever perform a calculation of any sort, always remember to write the units next to each number in your calculation and make sure that they cancel properly.
Further Reading More info about the metric systemincluding prefixes, at ChemTeam. Wednesday, August 10, This page is copyright by ILPI.
Unauthorized duplication or posting on other web sites is expressly prohibited. Send suggestions, comments, and new entry desires include the URL if applicable to us by email.
The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.Convert between many different pressure equivalents.
Information: "-force" is added to distinguish units of force from units of mass. The atmospheric engine was invented by Thomas Newcomen in , and is often referred to simply as a Newcomen timberdesignmag.com engine was operated by condensing steam drawn into the cylinder, thereby creating a partial vacuum which allowed the atmospheric pressure to push the piston into the cylinder.
Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area). AtmPres at Diff timberdesignmag.com Atmospheric Pressure at Different Altitudes Altitude Above Sea Level Temperature Barometric Pressure Atmospheric Pressure.
Atmospheric pressure is the force per unit area exerted by the weight of the atmosphere. To measure that weight, meteorologists use a barometer.
METEOROLOGIST JEFF HABY A barometer measures the air timberdesignmag.com air pressure is a function of how much air is pressing over an area.
Air pressure will change rapidly with a change in altitude.