Quote Originally Posted by rjs003 View Post
Get together a container of ice water ( ice and water with the ice no longer melting) this is 32 degrees
After performing the ice water test then a pan of boiling water with vapor raising from the liquid this is 212 degrees
Take the two reading and extrapolate the difference this is how you check for accuracey
You need to make your ice with distlled water, then make a slushy with the ice and distilled water.
Pure water boils at 212 degrees at a pressure of 30 inches of mercury- that is sea level, normal barometric pressure. You need to correct for altitude and barometric pressure, and again use distilled water.
The difference between these two points is then divided into 180 degrees for Fahrenheit and 100 degrees for Celsius (centigrade) thermometers.