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But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.

Beware of older studies (1970's or older) which can have much larger error bars.A good general rule for modern studies is expect a date to vary by ±5%.Potassium-argon can be compared with relative dating methods like fossils and bedding as well as absolute dating methods like Uranium-Thorium, Uranium Lead, Rubidium Strontium, and even it's own dates to check for consistency.Potassium is chemically incorporated into common minerals, notably hornblende, biotite and potassium feldspar, which are component minerals of igneous rocks.Argon, on the other hand, is an inert gas; it cannot combine chemically with anything.So we know that anything that is experiencing radioactive decay, it's experiencing exponential decay.And we know that there's a generalized way to describe that.In this video, I want to go through a concrete example.And it'll get a little bit mathy, usually involving a little bit of algebra or a little bit of exponential decay, but to really show you how you can actually figure out the age of some volcanic rock using this technique, using a little bit of mathematics.If the mineral composition of the two sample is different, so that the sample for measuring the potassium is richer or poorer in potassium than the sample used for measuring the argon, then this will be a source of error.In the last video, we give a bit of an overview of potassium-argon dating.