The conversion formulas between °F and °C are:
[°C] = ([°F] - 32) × 5/9
[°F] = [°C] × 9/5 + 32

86F = 30 Celcius (Centigrade)

Calories can not be measured by weight. They are a factor of the item being weighed. A pound of sugar has more calories than a pound of rice cakes.

Prime numbers are numbers that are only divisble by one and themselves. Thus the first few prime numbers are 1, 3, 5, 7, 11, 13, 17...etc.

Kelvin is an absolute unit of measurment.  0 degrees Kelvin equates to  -273.15 degrees Celcius or -459.67 degrees Fahrenheit. This point is known as absolute zero on the thermodynamic temperature scale....the temperature at which all thermal motion ceases in the classical description of thermodynamics. Thus (roughly) to find degress Kelvin from Celcius you calculate C + 273.15. To get Celcius from degrees Kelvin you calculate K - 273.15.