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Measurements density

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Measurements density

1. 1. Measurement and Units Density
2. 2. Density <ul><li>Mould a piece of plasticine so that it will float in water when dropped into it </li></ul>
3. 3. Density <ul><li>Objectives: </li></ul><ul><li>Define density </li></ul><ul><li>Calculate density of an object </li></ul><ul><li>Predict whether objects will float or sink </li></ul>
4. 4. Density <ul><li>Density is defined as the mass per unit volume of object. </li></ul><ul><li>SI unit: kg/m 3 </li></ul><ul><li>Other units: g/cm 3 </li></ul>
5. 5. Density <ul><li>The value of D increases when V decreases or m increases </li></ul><ul><li>The value of D decreases when V increases or m decreases </li></ul>
6. 6. Calculating Density <ul><li>Example </li></ul><ul><li>The density of water is 1000kg/m 3 . What is the mass of water needed to fill a tank of that has a dimension of 3 x 2 x 1? </li></ul>3m 2m 1m
7. 7. Calculating Density Mass, m, of water is 6000kg
8. 8. Floating and Sinking <ul><li>Comparing densities allow us to determine whether objects float or sink . </li></ul>
9. 9. Density <ul><li>Matter is anything that occupies space and has mass. Hence all matter has density . </li></ul><ul><li>Matter will sink or float in each other depending on their density . </li></ul><ul><li>Knowing density allows us to separate objects </li></ul>
10. 10. Density <ul><li>Why does a 1000kg log floats on water while a 10g steel screw sinks in water? </li></ul><ul><li>Floating and sinking depends on density and not mass alone. </li></ul><ul><li>The density of the log is smaller than that of water. (Log has big volume) </li></ul><ul><li>The density of the steel screw is greater than that of water. (Steel screw has small volume) </li></ul>
11. 11. Density <ul><li>Density in Application </li></ul>
12. 12. Conclusion <ul><li>Density is defined as the ratio of mass to volume. </li></ul><ul><li>Floating and sinking depends on density. </li></ul><ul><li>Different material have different densities. </li></ul>