Distinguish precisely and in scientific terms the differences among items in each of the following groups.

1. Coefficient, exponent, exponential
2. Equivalency, conversion factor, quantity, value, unit
3. Mass, weight
4. Unit, kilounit, centiunit, milliunit
5. Significant figures, uncertain digit
6. Uncertainty, exact number
7. The symbols = and
8. Fahrenheit, Celsius, kelvin
9. Direct proportionality, proportionality constant
10. Density, mass, volume