Volume, Mass, Density.

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Presentation transcript:

Volume, Mass, Density

Do Now What is the difference between mass and weight?

Mass Mass is the amount of matter in an object Measured in kilograms (kg, g)

Volume Volume is the quantity of three-dimensional space occupied by a liquid, solid, or gas Calculating the volume of a regular object by LxWxH V=LxWxH express volume include liters, cubic meters, gallons, milliliters, teaspoons and ounces

Calculating Volume Length x Width x Height Length 2 cm Width 3 cm Height 4 cm Length 20 cm Width 5.7 cm Height 9.5 cm Length 6.2 cm Width 5 cm Height 6.8 cm Length 20 cm Width 11 cm Height 5.5 cm Length 10 cm Width 5 cm Height 10 cm Units are cm^3 Length 6 cm Width 8 cm Height 9 cm

Volume Volume changes according to the external conditions. As an example, volume of a sample of gas depends on the air pressure. Volume of a solid can be changed when it is melted. Mass is the amount of matter an object contains, while volume is how much space it takes. https://www.youtube.com/watch?v=bkNAcua-oFE Unlike mass because mass cannot change

Measuring Volume of irregular Shapes How do we measure the volume of an apple when it isn’t a square or rectangle? Water!

Density Two different materials may have the same volume but different mass Wooden sphere and lead sphere Vice Versa : Two materials may have the same mass but not the same volume Kilogram of sand vs kilogram of feathers The volumes differ because sand and feathers have different densities Density: measure of the mass per unit volume  Density = mass divided by volume Example lead cube vs wooden cube Same volume (size and shape) but different masses https://www.youtube.com/watch?v=SimFy9wOMXY The lead cube is heavier, it is made up of more matter, therefore it has a greater density. More dense.

Calculating Density A small block of wood floats on the water. It has a mass of 200g and a volume of 250 cm^3. What is the density of the wood? 1. What information is given to you? Mass of Block = 200g Volume of Block = 400 cm^3

Calculating Density 2. Plan and solve What are you trying to calculate? Does is answer make sense? The density of the block -Yes! The density is lower than 1.0 g/cm^3 which makes sense because the wood floats in water Density = Mass/Volume Density = 200g/400 cm^3 Density = .50 g/cm^3

Calculating Density A block of copper has a mass of 500g and a volume of 250 cm^3. What is the density of the copper block? Formula  Density = Mass/Volume 500/250=Density 2 = Density Will is block sink or float?

Density Tower https://www.youtube.com/watch?v=-CDkJuo_LYs