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Vacuum scale


gatewood

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I'm looking for ways of making a cheap scale (doesn't need to be too precise) and I turned to vacuums to use as a countering force (or atmospheric pressure, to be more precise).

I'm thinking of simply sealing a syringe's barrel (the chamber) and then tying a little basket on the plunger (the tail), so I can weigh down the basket (with things I want to measure) and have the plunger move down to get a measurement.

What do you guys think? Is the principle practical for such purpose?

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As JC said, it won’t be linear, and will have a limited range of usefulness as well. But it should work at some level. You can compare the theoretical displacement with some calibrated masses and see how accurate it is. And test the dependence on the ambient temperature and pressure 

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