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Temperature å The temperature of an object determines the direction of heat transfer. u The average speed of the molecules åheat is transferred from object of high temp. to the object at low temp.

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The TWO temp. scales Celsius (° C) Freezing point of water is __________ Boiling point of water is __________ Freezing point of water is at __________ Boiling point of water is ____________ Absolute Zero - point at which there is NO molecular movement Equal to 0 K or -273°C Kelvin (K) 0° C 100°C 273.15 K 373.15 K

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How to convert K = °C + 273 or °C = K - 273 Remember: Kelvin does not have negative temperatures

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Sample problems 1. Please convert the following: 5 cm = ? m 10 g = ? kg 525 mg = ? G 2. What is the temperature -25°C expressed in Kelvins? 3. A copper penny has a mass of 3.1 g and a volume of 0.35 cm 3. What is the density of copper?

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Specific Gravity Specific gravity is a comparison of the density of a substance with the density of of a reference substance, usually at the same temperature. There are no units for specific gravity Specific gravity = density of material density of water at the same temp

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Specific Gravity If the density of a substance is 6.2g/cm 3 at a particular temp. and the density of water at the same temp. is 0.86g/cm 3, what is the specific gravity of the substance at that temperature?

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