W
whipped
Guest
In honour of Flaky.
I was just looking at the thermometer in front of me and thinking, "how could I heat this up to a temperture so I could go home from work". Then I wondered what would happen if I used a microwave to occomplish this. Here are the results :-
I was just looking at the thermometer in front of me and thinking, "how could I heat this up to a temperture so I could go home from work". Then I wondered what would happen if I used a microwave to occomplish this. Here are the results :-
In case you hadn't guessed, work is a little slow today.Putting a mercury thermometer in a microwave oven isn't a good idea. While mercury is a metal and will reflect most of the microwaves that strike it, the microwaves will push a great many electric charges up and down the narrow column of mercury. This current flow will cause heating of the mercury because the column is too thin to tolerate the substantial current without becoming warm. The mercury can easily overheat, turn to gas, and explode the thermometer. (A reader of this web site reported having blown up a mercury thermometer just this way as a child.) Moreover, as charges slosh up and down the mercury column, they will periodically accumulate at the upper end. Since there is only a thin vapor of mercury gas above this upper surface, the accumulated charges will probably ionize this vapor and create a luminous mercury discharge. The thermometer would then turn into a mercury lamp, emitting ultraviolet light. I used microwave-powered mercury lamps similar to this in my thesis research fifteen years ago and they work very nicely.