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

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

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

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

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

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

9. Measures temperature Tube filled with a fluid such as alcohol Thermometer

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

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

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

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

16. 2.Celsius Scale: Metric scale °C°C

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

18. Measuring with a thermometer 24°C

19. 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.

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

21. 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

22. 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..

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

24. 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.

25. 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.