so today, Maddy, Lilly and i all were in 'Heat Shields' lab. first we made a shield with a sheet of tin foil, that was connected to the screen, it lasted about 2:15 seconds. then we made the next one the same way, but with a double sheet of tin foil, and more air inbetween. our second one lasted more than 5:00 minutes, but we had to stop because MM was worryed about the propane torch. this shows that one of the best ways to spot heat is to have air inbetween.
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