Science Fair

My science fair topic is: What heat and temperature affects a magnet.
I choose this topic because in summer the magnets on our fridge keep falling off. My topic is about heating magnets up and seeing of they last on a fridge the longest if they are hot or cold. I thought this topic would be interesting because some people say that if you put a magnet on a fire place it will bubble up and then blown up. This didn't happen in my experiment because I only put the magnet on the fire place for 30 seconds. It was funny when I put the magnet in the oven it smelt really weird and it looked funny. For a while I thought the heat would make the magnet stronger but I was wrong. I now know that coldness will increase the strength of the magnet.