Check the grammar and spelling
Our project will make more heat than other projects because we have tin foil that reflect the heat and the shiny side of the tin foil keeps it warmer. We have a very soft blanket that will keep the water warm because its very soft and warm. This all will help winning the science project. On monday we tested our project. Before we had 74 temprature and after 45 minutes it was 59. We could win the science project but we got second place it was a very good project. But still we tried hard to win the project. I had a lot of fun.
Please check the underlined part because it doesn't make sense. Why was the temperature higher before the project than after?
Our project will make more heat than other projects because we have tin foil that reflects the heat and the shiny side of the tin foil keeps it warmer. We have a very soft blanket that will also help keep the water warm. This all will help contribute to a winning science project. On Monday we tested our project. Before we had 74 temprature and after 45 minutes it was 59. We could have won the science project but we got second place. It was a very good project. But still we tried hard to win the project. I had a lot of fun.
Here's the corrected version of your text:
"Our project will produce more heat than other projects because we have tin foil that reflects the heat, and the shiny side of the tin foil keeps it warmer. We also have a very soft blanket that will keep the water warm because it is very soft and warm. All of these factors will help us win the science project. On Monday, we tested our project. Before testing, the temperature was 74 degrees, and after 45 minutes, it decreased to 59 degrees. Although we only ended up getting second place, it was still a very good project, and we put in a lot of effort to try to win. I had a lot of fun."
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