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?
It is made up of many parts:
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.
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
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.
29kg+1kg+1kg+3kg+5kg= 39 kg
The weight and mass of a whole apple
is equal to the sum of each cut up piece
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.
The frozen bottle of water
liquid bottle of water will
equal mass and weight.
density will change.