Density & Temperature Measurements.

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Presentation transcript:

Density & Temperature Measurements

DENSITY 1 cm3 = 1 mL Density is a derived SI unit. It is defined as: Density=Mass/Volume For solids, units are generally g/cm3 For liquids, units are generally g/mL 1 cm3 = 1 mL

Relative Density The density of water is 1.0 g/mL (At 4.0°C). The relative density of any substance can be determined by adding it to water. If the substance floats, it’s density is less than the density of water: d < 1.0 g/mL If the substance sinks, it’s density is greater than the density of water: d > 1.0 g/mL 0.80 g/mL 1.0 g/mL 1.2 g/mL

TEMPERATURE Defined is a measure of the average kinetic energy in matter Temperature determines the direction of heat flow (always high  low)

Comparison of the three temperature scales

Temperature Scales *Same size unit! Fahrenheit (F) - FP of water is set at 32o BP is set at 212o *Celsius (C) - FP of water is set at 0o BP is set at 100o *Kelvin (K) - Zero point is Absolute Zero FP of water is set to 273.15 One Celsius Degree = One Kelvin Unit *Same size unit!

CONVERSIONS From Celsius toKelvin: K = C + 273 (more precisely, 273.15) From Kelvin toCelsius : C = K - 273