TOPIC: Measurement AIM: How is temperature measured? Do Now: Example #3 from yesterday’s notes. HW: Research due tomorrow!

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Presentation transcript:

TOPIC: Measurement AIM: How is temperature measured? Do Now: Example #3 from yesterday’s notes. HW: Research due tomorrow!

The units of density could be a.milliliters per gram b.milliliters c.gram d.grams per milliliter

Example #3 The mass of a marble is 8.8 g. It has a volume of 2 mL. What is the density?

D = m v D = 8.8 g 2 mL D = 4.4 g mL

Why does ice float in a glass of water????????

Density of ice = 0.92 g/mLDensity of water = 1.0 g/mL

Measures temperature Tube filled with a fluid such as alcohol Thermometer

Heated  molecules move faster and far apart –Liquid expands & rises up tube

Cooled  molecules slow down & move closer together –Liquid contracts and drops

1.Fahrenheit Scale: Non-metric temp scale °F°F What are the two scales that can be used to measure temperature?

Water freezes = 32°F Water boils = 212°F Human body temp = 98.6°F

2.Celsius Scale: Metric scale °C°C

Water freezes = 0°C Water boils = 100°C Human body temp = 37°C

Measuring with a thermometer 24°C

Let’s summarize… 1.What instrument is used to measure temperature? 2.Why does the liquid in a thermometer rise when the temperature is high? 3.What are two temperature scales used? Explain the difference between the two scales.

Review: 1. The units of density could be a.milliliters per gram b.milliliters c.gram d.grams per milliliter

2. What is the density of a 40- gram object with a volume of 20 milliliters? a.2 g b.2 ml/g c.2 g/ml d.2 ml/g

3. A cube is 1 cm on each side and has a mass of 2 grams. Will it float? a.yes b.no c.The only way to tell is to put it in water..

4. The density of water is a.1 mL/g. b.1 g/L. c.1 g/mL. d.1 kg/mL.

5. An object that floats in water has a density of a.less than 1 g/mL. b.equal to 1 g/mL. c.greater than 1 g/mL. d.equal to 10 g/mL.

1.Will an object with a density of 3.4 gm/cm 3 sink or float in a cup of water? Explain why. 2. Will an object with a density of.086 gm/cm 3 sink or float in a cup of water? Explain why.