In reply to Russ George's message of Sat, 21 Jan 2017 20:33:56 -0800: Hi, [snip] >Heat moves at the speed of sound in solids but is made at a far faster rate.
Actually, it moves much slower. The speed of sound in steel is about 6 thousand meters/second. The length of a teaspoon is about 10 cm. At 6000 m/s, it would take would take about 17 microseconds for you to burn your fingers when you stir your coffee. > Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
