Question

Observation: Hotter water seems to produce more bubbles than cold water when it is mixed with dish soap.

Question: Does water temperature affect the amount of bubbles that are produced from dish soap?

Hypothesis: Hot water produces more bubbles than cold water when it is mixed with dish soap.

What does D’Angela need to do to test this?
Do several trials, keeping water temperature the same but changing the type of soap.
Do several trials, keeping the type of soap the same but changing the quantity of soap.
Do several trials, keeping water temperature the same but changing the quanti