A barometer is used to measure atmospheric pressure. Atmospheric pressure is a measure of the amount of force air exerts onto the earth as it is pushed down from the atmosphere. Another term for atmospheric pressure is barometric pressure.
Know MoreAir pressure is a reliable weather predictor. Lower air pressure is usually an indication of rain. Likewise, the higher the air pressure, the more likely the chance of sun. Since lower elevations tend to have higher atmospheric pressures while higher elevations have lower ones, barometers must be calibrated specifically for the elevations in which they're located. Although mercury was originally used as the weather indicator in barometers, it has been almost completely replaced by aneroid barometers due to the highly toxic properties of mercury.
Learn more about MeasurementsA radian is a unit of angular measure widely used in many branches of mathematics and physics. One radian is equal to the measure of an angle at the center of a circle with an arc that is equal in length to the radius of that circle. Since the perimeter of a circle is found by doubling the radius and multiplying by pi, one radian is equal to 180 degrees divided by pi, or roughly 57.2958 degrees.
Full Answer >A bimetallic strip thermometer is a mechanical thermometer that is commonly used for its temperature control. This type of thermometer is robust, simple and has a wide temperature range. It contains two strips that are bonded together and made of dissimilar metals.
Full Answer >When measuring the length of a pencil, centimeters are used rather than millimeters because a pencil is more than a centimeter long. Millimeters are used when measuring lengths that are less than a centimeter, such as a pencil's width.
Full Answer >The term "um" is used as an abbreviation for the micrometer, although the proper abbreviation is the Greek symbol mu in place of the u. A micrometer is also referred to as a micron.
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