# Physical Quantities

This page is intended to be a quick reference for the different physical quantities and some common conversions CSHOs will need to know while performing their job duties.

## Base Quantities

Base quantities are those quantities that cannot be defined by any other quantities. For example, length is a base quantity because length is composed of no other quantities. However, surface area is a quantity composed of two length measurements.

The first unit name given below is the International System of Units (SI)-preferred unit. Conversions will be listed to other common units.

Quantity SI Unit (Symbol) Common Units Conversion Factors
Length meter (m) inch (in)

foot (ft)

mile (mi)

1 m = 39.37 in

1 m = 3.28 ft

1 km = 0.62 mi

Mass kilogram (kg) pound (lb) 1 kg = 2.2 lbs

1 g = 0.035 oz

Time second (s) hour (hr)

day (d)

1 hr = 3,600 s

1 d = 86,400 s

Temperature kelvin (K) Celsius (°C)

Fahrenheit (°F)

ΔK = Δ°C

°C = (°F-32)•5/9

°F = (9/5)•°C + 32

Amount mole (mol) count 1 mol = 6.022 x 10²³
Electric Current ampere (A)
Luminous Intensity candela (cd)