As a closed system (not isolated), I was curious why the plastic wrap wouln't return to flat after is convex expansion as it returned to initial room temperature.
Is it related to the hysteresis in the asymetry of the boiling curve vs condensation? ____________________________________________ CEO Founder, Simtable.com [email protected] Harvard Visualization Research and Teaching Lab [email protected] mobile: (505)577-5828 On Tue, Oct 22, 2024, 8:21 AM Nicholas Thompson <[email protected]> wrote: > To produce the illusion: > > Take an ordinary water glass, put a little water in it, stretch some > plastic wrap tightly over the glass and put it in the microwave for a few > seconds. > > Leave it in the microwave for a minute to cool down .(Please don't do > anything stupid and scald yourself.) > > Remove the glass (see above, "....stupid") from the microwave. The > plastic should have formed a concave beaded surface on the top of the= > glass. > > Wonder, "What is the mathematical form of that surface?" > > Examine the surface under a vertical lamp (like a desk lamp or a ceiling > bulb) > > An image of the lamp willl appear floating inches above the surface of > the plastic. > > Tilt the glass just right, and you will see a *convex* surface enclosing > the top of the glass. > > Wonder: "Have I made a parabolic surface?" > > Write email to Friam. > > Receive dope slaps from colleagues for not looking it up on the internet > first. > > > > > > -- > Nicholas S. Thompson > Emeritus Professor of Psychology and Ethology > Clark University > [email protected] > https://wordpress.clarku.edu/nthompson > -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . > FRIAM Applied Complexity Group listserv > Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom > https://bit.ly/virtualfriam > to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: 5/2017 thru present > https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >
-. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . FRIAM Applied Complexity Group listserv Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom https://bit.ly/virtualfriam to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com FRIAM-COMIC http://friam-comic.blogspot.com/ archives: 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/
