In their investigation they measure the time taken for 5 teaspoons of salt to dissolve in 400 ml of water. They carry out their investigation 3 times and record their results.
Why did they carry out their test 3 times
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Explanation:
There are alot of reasons for performing an experiment more than once. But on of the main reason is to avoid the chances of error.
There are several type of errors that can occur during experiment e.g. human error, instrumental error, conditional error.
SO, due to all these errors it is recommended to perform the experiment more than once to minimize the effect of error
learn more about errors from the link below
https://brainly.com/question/10299055
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