```![enter image description here][3]

----------

The ![enter image description here][1] is a unitless number, that summarizes the effect of raising temperature 10º C on the rate of a chemical reaction. A ![enter image description here][2] of 2.0 suggests that raising the temperature of a system by 10º C will effectively double the rate of the reaction. This value would be expected for most chemical reactions occurring within normal physiological temperatures.

Mathematically, ![enter image description here][1] can be represented by the following expression:

![enter image description here][4]

where

t2 = higher temperature    k2 = rate at t2
t1 = lower temperature     k1 = rate at t1

Ussualy the temperature difference is about 10º C, then you can simplify the equation

![enter image description here][5]

[1]: http://i.stack.imgur.com/Apbvg.gif
[2]: http://i.stack.imgur.com/Apbvg.gif
[3]: http://i.stack.imgur.com/qqVuB.gif
[4]: http://i.stack.imgur.com/THkdC.gif
[5]: http://i.stack.imgur.com/8PkD6.gif```