The document discusses the law of conservation of mass, which states that the total mass of all objects is equal to the sum of the mass of its parts. This is illustrated using the example of a chair, where the total mass of the chair (39kg) equals the sum of the individual masses of the parts that make it up (wood, nails, stuffing, cushion, cloth). Additional examples show that the same is true for cutting up an apple, mixing milk and chocolate powder, and freezing water - the total mass remains the same even if the object changes form.

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