FINDING VOLUME

VOLUME Measurement of the amount of space that the object takes up. Objects are 3D meaning they have three dimensions, so volume must include all three In the metric system we have two ways of recording this Cubic centimeters cm 3 and liters (L), generally milliliters mL

LIQUIDS We have tools to measure liquids in science Called Graduated cylinders  Graduated means that it is marked in a consistent pattern  Easy and fast but you have to watch for the meniscus

LIQUIDS Meniscus is water stuck to the sides, giving a bad Measurement. You need to measure from the lowest point, it is in the middle

SOLIDS Not as easy to measure as liquids Some have an easy shape to measure we call those regular shaped solids Some have a hard shape to measure we call those irregular shaped solids

REGULAR SOLIDS(RECTANGLES ) Measure the sides of the object, don’t forget it is 3D so measure three sides. We often use terms length, width height or l, w, h Once you have all three sides you multiply them all together l × w × h

REGULAR SOLIDS (CYLINDERS)

IRREGULAR SOLIDS Too difficult to measure directly so we measure indirectly One great method to use is Displacement Displacement is the amount of a fluid that the object moves out of the way when it is fully submerged The volume of fluid moved is the same as the volume of the object

IRREGULAR SOLIDS This works on everything from people to Battleships In labs we can place objects into Graduated Cylinders with a fluid, generally water and then we can see how much volume is displaced. In class demo, Cylinder and Marbles

GASES Very difficult to measure volume of a gas You need to contain the gas  In class demo, gas in one breath, measuring volume and mass

MORE REGULAR SOLID SHAPES/ NOTECARDS

DENSITY

Measurement of the amount of matter in an area Combines mass and volume Set value for every substance(element or compound) regardless of how much of it you have.

DENSITY Scale begins at 0 and goes up from there Water is the reference point, 1 g/cm 3 or 1000 kg/m 3 Objects of larger density, sink below objects of lower density Air at 20 degrees kg/m 3 Air at 10 degrees kg/m 3 Air at 30 degrees kg/m 3 Which one sinks below the others?

DENSITY

Demo video

SUMMARY Write a summary on Density