|MadSci Network: Physics|
I tried this experiment w/ my 8th grade to prove the law of conservation of mass. Here it is: Question: Will a change of volume affect the mass of matter? Hypothesis: The law of conservation states that matter can neither be created nor destryed so it wouldn't change. Procedure: 1. Measure the mass of an empty graduated cylinder. 2. Measure the mass of an empty beaker. 3. Put 15 ml of popcorn kernels in cylinder. 4. Measure the mass of cylinder and kernels. 5. Cook kernels in airpopper. 6. Place popcorn into empty beaker. 7. Measure the mass of beaker and popped corn. Data: mass of empty cylinder 27g empty beaker 51 g mass of kernels & cylinder 30g beaker & popped corn 61g mass of kernels 3g popped corn 10 g volume of kernels 15 ml popped corn 325ml I did this twice and in both experiments the mass of popped corn increased. The kids and I are confused. The humidity was normal; it wasn't raining. I expected the mass to go slightly down because normal kernels contain @ 14% water. I could have explained that to the children. But could it have gained 7g of air from the environment? Help?!?
Re: Why did my popped corn have higher mass than my kernels?
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