Mass, Volume & Density 8th Grade Science.

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Presentation transcript:

Mass, Volume & Density 8th Grade Science

What is Mass? -The amount of matter an object has. -Unit of measurement = kg or g -What tool do we use to find mass?

What is Volume? -The quantity of space an object occupies. -Unit of measurement = ml or cm3 so which one do you use when? -What tools can we use to find volume?

Finding Volume of a Regular Shaped Object -Volume of a cube = L x W x h -Volume of a cylinder = πr2h -Volume of a sphere = 4πr3 3 Let’s practice! Cube: 2 cm L, 2 cm W, 2 cm h

Finding Volume of an Irregular Shaped Object -Can’t use a ruler!!! -Find volume by water displacement method. -Volume of water with object – volume of water before object -Don’t forget to read the graduated cylinder from the bottom of the meniscus!!!

What is Density? -How much mass is contained in a given volume. -Equation: density = mass ÷ volume d=m/v -What would the unit of measurement be? You have to represent both measurements! g/ml or g/cm3

Why is Density Important? Building Ships Airplanes Pipe Systems Oil Spills

Why is Density Important? -Every element has its own unique density. How could that help?