Materials:

• Bowl of water
• Orange

Instructions:

• Float an orange in a bowl of water and challenge the children to try make it sink.
• Now peel the orange.
• Put it back in the water and watch what happen.
• Why does the orange sink?
• Orange skin is full of trapped air bubbles.
• This makes the orange light for its size, so it floats.
• Without its skin and the air bubbles inside it, the orange weighs a lot for its size.
• The peeled orange is denser than water, so it sinks.