題組內容
13, A little boy, named Johnny, got a beautiful red balloon at his friend's birthday party on a snowy day. The balloon was filled with helium up to 0.25 MPa. After having a good time indoors, Johnny and his father decided to walk home in the -5.0 ℃ weather. As they walked, Johnny's balloon shriveled up and flopped to the ground. It seems that the balloon cooled down and shrank.
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