How to write an experimental composition for primary school students?

At noon on Tuesday, five people in our class went to the laboratory to do experiments. We came to the lab (1) and the teacher asked us to draw lots. I drew the number 22 and sat in the seat on the number 22. I waited for a long time, from noon to the third class in the afternoon. Because I painted it for a long time.

Finally, it touched me and my heart was pounding. I walked in slowly. The experiment I want to do-measuring the water temperature. The teacher asked me to read the instructions before I could do the experiment. I picked up the beaker and measuring cylinder, and poured water into the measuring cylinder with the beaker, just pouring 150 ml. I poured warm water from the measuring cylinder into another beaker. Then, I picked up the thermometer and measured the temperature of warm water in the beaker. I saw the thermometer stop at 30 degrees Celsius, so I read 30 degrees Celsius. The teacher measured it and said, "No, it should be 32 degrees Celsius." I heard from the teacher that points will be deducted if readings are not accurate.

I want to win the first prize, but now the plan has fallen through. I went back sadly.