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As another example, consider the potential energy of an object in the gravitational field of the earth at a height h above the earth’s surface. = mgh, where g is the acceleration due to gravity, 9.8 ms−2. units calculation would therefore give: = (kg) (ms−2) (m) = kg m2 s−2.
Explain the process of measurement and describe the three basic parts of a quantity. Describe the properties and units of length, mass, volume, density, temperature, and time. Recognize the common unit prefixes and use them to describe the magnitude of a measurement. Describe and calculate the density of a substance.
Volume is an important quantity that uses a derived unit. Volume is the amount of space that a given substance occupies and is defined geometrically as length × width × height. Each distance can be expressed using the meter unit, so volume has the derived unit m × m × m, or m 3 (read as “meters cubed” or “cubic meters”). A cubic ...
A measurement contains a number and a unit. A unit specifies the physical property and the size of a measurement, while the number indicates how many units are present.
lists the symbols for quantities in a wide range of topics used in physical chemistry. New parts of this chapter include a section on surface structure. The third chapter describes the use of the International System of units (SI) and of a few other systems such as atomic units. Chapter 4 outlinesmathematicalsymbolsandtheiruseinprint.
For example, if we want a unit to express the idea of speed (the distance traveled per unit of time), the unit is meters/second (m/s), where the diagonal line indicates a division. An object traveling 35 meters in 12 seconds is travelling 35/12 = 2.92 m/s.
In chemistry, we use the metric system to measure length The unit o-P length is the meter (m). The meter is a tiny bit larger than a yard. (3 -Peet). The meter is good -Por measuring moderately large distances. For example, a -Pootball -Pield is 91.4-4- meters. But what iP we need to measure short lengths, like the length oP a pencil?
