How can you make a foam cup melt.Not by using fire.
It's for a science experiment.
There are lots of ways that you can make a foam cup melt like with the use of nail polish remover. Nail polish remover has acetone which reacts with to foam cup causing it to melt. Have a look at these http://tlc.howstuffworks.com/family/science-projects-for-kids-chemical-reactions1.htm and http://www.youtube.com/watch?v=4KkYjRk4qcU.