From: Paul Doherty (pauld@exploratorium.edu)
Date: Thu Nov 21 2002 - 11:32:00 PST
Message-Id: <l0311076aba02e175080d@[192.174.3.125]> Date: Thu, 21 Nov 2002 11:32:00 -0800 From: Paul Doherty <pauld@exploratorium.edu> Subject: Re: pinhole Meters
Hi Art
How accurate does he want the measurement?
I'd use my altimeter watch which is simply a barometer, but it only goes
down to 1/3 of an atmosphere.
Otherwise I'd use an aneroid pressure gauge down to 1/100 th atmosphere.
Almost any moodern digital multimeter is suitable for measuring battery
voltages.
You can get one for $15 or less at Radio Shack.
You can expect a good fraction of a volt.
To measure curreent from the weakest batteries you need an ammeter that can
measure 100 microamps or so.
although a reasonable battery will generate 10's of milliamps.
Paul D
>The chem teacher at my school asked me if there is a
>meter that can be put into a vacuum chamber to display
>the pressure?
>
>He also wanted to know what would be best meter to use
>to find small voltages generated making a battery.
>
>Any suggsetions??
>
>Thanks, Art
>
>
>
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