The Arrhenius equation is an expression that shows how the rate constant of a chemical reaction, absolute temperature, and the aging factor are related. The Arrhenius equation indicates that a +10°C increase in temperature doubles the rate (known as an Q10 factor of 2) of chemical reaction. This is the most popular and conservative method of calculating Accelerated Aging. It's used to test shelf-life claims and document expiration dates by simulating real-world shelf-life aging.