Nature's egg timer?
August 15, 2012 5:14 AM Subscribe
What readily available materials change state at a constant, predictable rate in an easily observable manner?
posted by londonmark to science & nature (12 answers total) 2 users marked this as a favorite
As I understand it, carbon dating works because we can calculate the decay of carbon 14 fairly accurately (and apologies to any physisists reading this if that's a sloppy attempt at explaining it). I'm after things that work in a similar fashion, but over much shorter timescales and in an immediately observable way. Like an egg timer, but without the mechanical construction. Are there, for example, any materials that oxidise at a steady state (without the need to control environment)?