ILLUSTRATE THERMAL EXPANSION, VOLATILITY, VAPOR PRESSURE, ETC.
The simple "handboiler" contains a volatile liquid (methyl chloride). DO NOT DROP. Volatile liquids have much steeper P vs. T curves than water, for example. Warming the bottom bulb increases the pressure there and drives the fluid "crazy". Originally marketed as a "Hand-Boiler" scientific toy, recently the advertising agency changed the title of this little device to a "Love Meter" in order to increase sales. It probably didn't work because I don't think you can get these any more (maybe because of the methyl choride - which is not a healthy substance).
©2000. John Hart, University of Colorado