In materials science, quenching is the rapid cooling of a workpiece in water, oil or air to obtain certain material properties. A type of heat treating, quenching prevents undesired low-temperature processes, such as phase transformations, from occurring. It does this by reducing the window of time during which these undesired reactions are both thermodynamically favorable, and kinetically accessible; for instance, quenching can reduce the crystal grain size of both metallic and plastic material
The length of the day in Walla Walla varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 38 minutes of daylight; the longest day is June 21, with 15 hours, 46 minutes of daylight.
December 2015 â Sun in Seattle. December Solstice (Winter Solstice) is on Monday, December 21, 2015 at 8:49 PM in Seattle. This day is 7 hours, 34 minutes shorter than on June Solstice. In most locations north of Equator, the shortest day of the year is around this date. Earliest sunset is on December 10 or December 11.