Matter, It is everything around us that occupies space., Mass, It is the amount of matter in an object., Scales, These are objects that we use to measure mass., Volume, It is the amount of space that an object occupies., Measuring cylinder, We use it to calculate the volume., Density, It is a measurement of the amount of matter contained in a certain volume., Buoyancy, It is the invisible upward push water (or air) gives to objects, acting like a hidden hand that helps things float., Atmosphere, Layers of gases that the Earth is sorrounded by., Air, It is a mixture of different gases., Nitrogen, It is the most abundant gas., Friction, It is a force between two surfaces that are in contact., Engines, These are machines that use different energy sources to provide enough force to make vehicles move..

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