CORRECTION.

"An ounce of prevention" (SN: 7/15/00, p. 45) incorrectly states that carbon dioxide is a liquid only above 31 [degrees] C and 73.8 atmospheres. In fact, that's the point above which it is a super-critical fluid, in which there's no difference between the liquid and gas states. Carbon dioxide can be liquefied at temperatures between -56.6 [degrees] C and 31 [degrees] C at pressures as low as 5.2 atmospheres.