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Re: [Phys-l] T dS versus dQ

From: WC Maddox

The experimentalists among those receiving these Tds vs dQ messages may want to show the temperature difference between slow pressure increase and rapid pressure increase by using the device shown here: It has a digital temperature display. If you turn the screw slowly you will not see a temperature change. If you turn the screw rapidly you get ~ 1 degree (C) increase for full travel of the piston. This is with the only insulation being the plastic tube. You can then demonstrate cooling during expansion by turning the screw the other way rapidly.

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