Units You Will Use Frequently:

Length:

• meter (m)
• centimeter (cm): \(100\:\rm{cm} = 1\:\rm{m}\)
• millimeter (mm): \(1000\:\rm{mm} = 1\:\rm{m}\)
• nanometer (nm): \(10^{9}\:\rm{nm} = 1\:\rm{m}\)

Mass

• kilogram (kg)
• gram (g): \(1000\:\rm{g} = 1\:\rm{kg}\)

Time

• second (s)
• minute (min): \(1\:\rm{min} = 60\:\rm{s}\)
• hour (hr): \(1\:\rm{hr} = 3600\:\rm{s}\)
• year (yr): \(1\:\rm{year} = 3.156\times 10^{7}\:\rm{s}\)