Subject: Hair dryer in a can?

how can i create heat by using gases? i have to do a science project for 
school and i chose to invent something. it is a 'hairdryer in a can' a 
hairdryer in an aerosol can (thus requiring no batteries etc. and easily 
portable). and i am trying to find out how i can cause heat to come out of 
the nozzle when it is pushed. i know that deoderant is very cold when it 
comes out of the nozzle, can one reverse this process to create heat with 
gases? if this is not possible, do you have any suggestions (on how to 
generate heat without electricity)?

Re: Hair dryer in a can?