When using a manometer to check Boyle's law, why is the pressure changed slowly?

a. to avoid compressing the liquid
b. to avoid compressing the gas
c. to avoid changing the gas temperature
d. to avoid changing the mass of the gas

Is it B?

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  1. No.

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  2. My next guess is C.

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  3. Yes, you're right.

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  4. Thank you

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