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# Measurements density

## by joeltoh on Aug 25, 2010

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## Measurements densityPresentation Transcript

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