 | ||||||
| ||||||
How is dry ice made?
Dry ice--frozen carbon dioxide--is often used to preserve perishable food, such as ice cream (God bless it). But you might perish if you ever ingested dry ice because its temperature is around -110 degrees F. It's cold enough to burn you if you even touch it.
They make dry ice by subjecting carbon dioxide to very high pressure and extreme cold. It turns into a liquid that, when it evaporates, forms a deeply frigid, snow-like substance. That "snow" is then compressed into blocks of dry ice. If allowed to "melt," dry ice goes directly from a solid state back to a gas, a process known as sublimation. That's the same word psychiatrists use to describe substituting a benign or creative impulse for a baser one--such as treating yourself to a nice cold dish of ice cream instead of taking an ice pick to someone who's annoying you.
One poll says one American in four has yet to ride in an airplane. As for the three out of four who have, most have flown several times. Incidentally, fewer than two percent have been "bumped" from a commercial flight. And for every person who prefers an aisle seat, there are three who prefer windows.
"The advantage of a bad memory is that one enjoys several times the same good things for the first time."
Other places to isit
