Evaporating is the right one
Explanation:
Student A would be introducing more error. While student B is subtracting the actual filter paper used in the experiment, Student A is using the mass of a different filter paper, which may have a slightly different mass than the filter paper that was used. To avoid having to aacount for this, or introducing such an error, follow Student B in weighing the filter paper before adding the sand.
I hope this helps.
<span>when temperature varies:
volume & temperature vary directly @ constant pressure,... Charles' law
pressure & temperature vary directly @ constant volume,... Gay-Lussac's law
when temp is consatnt:
Pressure & volume vary inversely , ...Boyle's law
Hope This Helped! :3</span>
