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Article #15486Re: How Does a Radiometer Work?
From: Alan Uncle Al Schwartz
Date: Tue, 19 Dec 1995 00:00
Date: Tue, 19 Dec 1995 00:00
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1813 bytes
Reasonable intensities of light have insufficient momentum to
meaningfully drive small surface areas of large mass.
The radiometer is under a light vacuum. Heating of the black side of
each vane launches mass convection currents with sufficient orthogonal
component to drive the vanes.
The obvious experiment is to erect the system on a vacuum line with a
good dynamic pressure gauge, illuminate with constant intensity light,
and use a strobe or rpm counter to graph rotational velocity vs pressure.
Add a variety of gases for different molecular weights, and you have a
spiffy publication for J. Chem. Ed.
--
Alan "Uncle Al" Schwartz
uncleal0@ix.netcom.com ("zero" before "@")
http://vvv.com/adsint/freehand/uncleal/
"Quis custodiet ipsos custodes?" The Net!
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10b271,54420a3edecc5a16 X-Google-Attributes: gid10b271,public X-Google-Thread: 1110fe,54420a3edecc5a16 X-Google-Attributes: gid1110fe,public X-Google-Thread: fd878,54420a3edecc5a16 X-Google-Attributes: gidfd878,public X-Google-Thread: f6c41,54420a3edecc5a16 X-Google-Attributes: gidf6c41,public X-Google-Thread: 114713,54420a3edecc5a16 X-Google-Attributes: gid114713,public From: Alan \"Uncle Al\" Schwartz <uncleal0@ix.netcom.com> Subject: Re: How Does a Radiometer Work? Date: 1995/12/19 Message-ID: <4b6nep$gu3@ixnews2.ix.netcom.com> X-Deja-AN: 122306918 references: <kevinl-1812951936500001@tsb-oc-26.earthlink.net> to: kevinl@earthlink.net content-type: text/plain; charset=us-ascii organization: The Noble Krell x-netcom-date: Tue Dec 19 7:58:17 AM PST 1995 mime-version: 1.0 newsgroups: sci.physics,sci.physics.particle,sci.physics.accelerators,sci.physics.electromag,fj.sci.physics x-mailer: Mozilla 1.1PE (Windows; I; 16bit)