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- 1. The Law of Conservation of Matter
- 2. Mass Let’s examine this chair. It has a mass of 39 kg and weight of 86 lbs. (So, kind of heavy) Where does this mass come from?
- 3. Mass It is made up of many parts: Wood 29 kg Nails 1 kg Stuffing 1 kg Cushion 3 kg Cloth 5 kg ----------------------------39 kg
- 4. Mass Which part gives the chair it’s mass? They all do. The mass of the chair is exactly equal to the mass of the things that make up the chair. In fact, the mass of any piece of matter is equal to the combined mass of all the things that it contains.
- 5. Notes: The total mass of all objects is equal to the sum of the mass of its parts. The same is true for the objects weight, the weight of an object is equal to the weight of all it’s parts together.
- 6. Mass That simply means that if we add up all the individual parts of the chair (wood, nails, cloth, stuffing, cushion) we can find the total mass of the chair. Wood+Nails+Cloth+Stuffing+Cushion=Total of Chair 29kg+1kg+1kg+3kg+5kg= 39 kg
- 7. Other Examples The weight and mass of a whole apple is equal to the sum of each cut up piece added together.
- 8. Other Examples 450 g 15g 465 g If you measure the mass of a glass of milk and the mass of some chocolate powder. Then you mix them together to make chocolate milk. The mass of the chocolate milk will equal to the mass of the milk and chocolate powder added together.
- 9. Other examples The frozen bottle of water and the liquid bottle of water will have equal mass and weight. *Only their density will change. liquid frozen

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