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COMMON QUANTITIES AND UNITS OF MEASUREMENT

Important, measurable quantities or variables, along with their symbols and common units of measurement, are as follows:

  • • Temperature, T, in degrees centigrade or Celsius (°C), or in Fahrenheit (°F), or in Kelvin units (K).
  • • Mass, m, in grams (g), or in kilograms (kg) (SI unit).
  • • Amount, n, measured in moles, one mole being 6.022 xio23 particles (e.g., atoms, molecules, or formula units); see Section 1.4.
  • • Molar Mass, MM, the mass in grams of 6.022 x 1023 atoms of an element or molecules of a compound, that is, one mole of a substance; see Section 1.4. The terms molecular weight and formula weight are often used interchangeably with molar mass.
  • • Avogadro’s Number or Constant: 6.022 x 1023 particles or items per mole.
  • • Volume, V, in cubic centimeters (cm3) or liters (L).
  • • Pressure, P, in atmospheres (atm), pascal, tore, or psi.
  • • Density, d, in grams per cubic centimeter (g/cm3) or grams per milliliter (g/mL).
  • • Concentration may be expressed in any one of several units, depending on the application; see Section 1.7.

Note that amounts of substances are expressed in grams (unit of mass) or moles. Liter is a unit of volume.

 
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