medium · Act science
A class tested how the concentration of salt affects how fast water boils away. They held the heat source, container, and starting volume constant and varied the salt concentration: 0%, 2%, 4%, and 6%. They then timed how long each took to lose 50 mL of water.
In this experiment, what is the independent variable?
- The time taken to lose 50 mL of water
- The concentration of salt in the water
- The amount of heat supplied by the source
- The starting volume of water in the container
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