### Video Transcript

Which item is lightest, the bottle
of milk or the apple?

In our question, we’re asked to
find the item that’s lightest, in other words, the object that weighs the least. If we had a set of scales and we
put the bottle of milk on one end and the apple on the other, we’d see straight away
which item was lightest. But in this question, we’re not
comparing these objects directly. Instead, we’re using a third object
to help. Can you see what it is? It’s this pot of strawberry
jam. By comparing both objects with the
pot of jam, we should be able to work out which one’s the lightest.

Let’s look at the pictures. In the first picture, we can see
that we’re comparing the bottle of milk with a pot of jam. The bottle of milk has pushed that
end of the scales right down, hasn’t it? And this has lifted the pot of jam
in the air. So, what can we say about the
bottle of milk? The bottle of milk is heavier than
the pot of jam. Now, let’s look at our second
picture. This time, we’re comparing the
apple with the pot of jam. And this time, it’s the end with
the pot of jam on it that’s weighed down, and it’s the end with the apple on that’s
moved upwards. So, what can we say about the
apple? The apple is lighter than the pot
of jam, isn’t it?

We’ve compared both our objects
with a pot of jam. And we can use the information
we’ve got to work out which item is lightest. We know that the bottle of milk is
heavier than the pot of jam, but the apple is lighter than the pot of jam. So, we know that the apple must be
lighter than the bottle of milk. The lightest item is the apple.