Question

you used weight to change the
of the gas and measured the

Answer 1

It looks like your sentence got cut off. Which variable did the weight change and which did you measure? Common completions for typical gas experiments:

- "You used weights to change the pressure of the gas and measured the volume." (Boyle’s law)
- "You used weights to compress the gas and measured the pressure." (same idea, inverted phrasing)
- "You added known masses to the piston to change the force (and thus the pressure) on the gas and measured the resulting volume." (more explicit)
- "You varied the applied weight to change the gas pressure and recorded the pressure–volume relationship." (general)
- "You used weights to change the gas volume and measured the pressure and temperature." (if you measured multiple variables)
- "You used weights to change the pressure of the gas and measured its temperature response." (if looking at thermal effects)

If you tell me which experiment you did (Boyle’s law, Charles’s law, a piston set-up, etc.) and which quantity you measured, I can give a polished sentence for your report and suggest how to report uncertainties and units.