Why does the air go wrinkly when it gets hot?, asks seven-year-old

Holiday season is in full swing but there is no rest for the curious mind. This question was sent in by seven year-old Dominic, from the beach in France, while on holiday.
Why does the air go wrinkly when it gets hot?, asks seven-year-old

Dominic would like to know…

Why does the air go wrinkly when it gets hot?

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