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Path: utzoo!watmath!clyde!cbosgd!cbdkc1!desoto!cord!ihnp1!ihnp4!zehntel!dual!mordor!space@mit-mc
From: space@mit-mc
Newsgroups: net.space
Subject: Crookes radiometer
Message-ID: <795@mordor.UUCP>
Date: Fri, 1-Mar-85 17:55:45 EST
Article-I.D.: mordor.795
Posted: Fri Mar  1 17:55:45 1985
Date-Received: Sun, 3-Mar-85 04:26:34 EST
Sender: daemon@mordor.UUCP
Lines: 7

From: Dick Koolish 

Crookes radiometer does not work by light pressure.  The globe contains
a low pressure gas.  The incomming light heats up the dark side of the
vanes.  When a gas molecule hits the dark vane, it absorbes some of the
heat and rebounds faster than if it hit the cool silvered side of the vane.
This is what makes the vanes turn.