Father: What do you see in that boyfriend of yours?
Teen daughter: Well... he’s reliable.
Father: He’s always late picking you up!
Teen daughter: I know and I can always count on it.
Remember when you had to sit in the front room with my dates until I was ready?
Father: Now that you mention it, I’m beginning to like this guy!
Willem Hendrik KeesomBorn 21 Jun 1876; died 24 Mar 1956 at age 79.Dutch physicist who was apioneerin cryogenics and was the first to solidify helium under pressure (1926). He was a research assistant for Kamerlingh Onnes working on the liquefaction of helium, and several years later, subsequently succeeded him (1923) as director of the Physics Laboratory at Leiden. In work done with M. Wolfke, after studying discontinuities in several properties of helium at very low temperatures (1927) they suggested that it may be due to a phase change. They called the helium above the transitional helium I and the helium below the transition helium II. In 1932, he produced a temperature just two degrees above absolute zero (-272° C or -457.6° F). In 1942 he wrote the book Helium. |
