Heating a marshmallow

So what we did in class is we went to the staff room in our school and heated up marshmallows for either 30 seconds or one minute in a microwave  what happened was it grew and it became bigger also it became harder when we took it out of the microwave we think this is we think this happened because of the heat in the microwave also it needed space so what we really think what was that the heat in the air gave more space to the marshmallow so it grew bigger also the marshmallow was really crispy. 

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