Get two buckets. Fill up one bucket
with cool - not too cold! - water. Fill the other bucket with warm
- not too hot! - water. Put one of your hands in the bucket with
cool water and the other in the bucket with warm water. Leave them
in the water for around twenty minutes - it might be a good
experiment to do whilst you watch TV!
What do you
The skin on your hands should be
wrinkly, like it is after you've had a bath. The hand that was in
the warm water should be more wrinkly than the hand that was in the
Why does this
This video from Professor Gizmo
Most of the skin we see on our bodies
is dead skin - it sounds a bit disgusting, but it's normal! Our
fingers and toes have thick layers of this dead skin. Underneath
the outer layer of dead skin are inner layers of living skin. When
we have a bath the layer of outer skin absorbs water. This causes
the skin to swell and get wrinkly.
The hand that was in warm water is
more wrinkly because in hot water the water molecules have more
energy. This means that they can move around faster and so more of
them are absorbed by your skin.
Next time you have a bath you'll know
why your feet and hands get wrinkly!