Hi this isn't a hard question I just can't understand what it's asking me... Please help!
"How many variables differed between the experiments?
The lab we did was adding water drops and soapy water drops on a penny to measure the surface tension, we also another one with 4 different temperatures of water.
Stacey Warren - Expert brainly.com
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we also did* another one
To me, it is just 1 water vs soap.
but we did 2 different experiments... and for the other on we tested the surface tension with water that was 4,25,37, and 100 degrees..