1. Temperature How Hot is it?

2. Temperature Temperature is a measure of the average kinetic energy of a molecule of a substance, or… How “hot” it is. On Temperature Scales a higher number of degrees indicates that a substance’s molecules are moving faster The lowest possible temperature is when the molecules don’t move at all. This is called Absolute Zero.

3. Temperature Scales There are 4 Temperature Scales: Fahrenheit: Water freezes at 32°F Boils at 212°F Absolute Zero is about -460°F Celsius(Centigrade): Water Freezes at 0°C Boils at 100 °C Absolute Zero is about -273 °C A Celsius Degree is nearly twice a Fahrenheit degree. Rankine: uses Fahrenheit degree, Absolute Zero = 0 °R (almost no-one uses it) Kelvin : uses Celsius Degree, Absolute Zero = 0 °K This is commonly used by astronomers