When I feel hot I become larger, Guess what?

Trending Puzzle : Most people will fail this simple equation

When I feel hot,  I wear my jacket inside-out.  I make a lot of noise when doing so.  I then become larger but... Guess what??  I weigh less now.  What am I?

Riddle : What am I?

When I feel hot,

I wear my jacket inside-out.

I make a lot of noise when doing so.

I then become larger but… Guess what??

I weigh less now.

What am I?

 

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