Organic chemistry polymerisation
Rate of a reaction depends on the temperature conditions. So to make a reaction proceed significantly, we have to take the reactants up to the level of activation energy. One more thing to note here is that low temperature is not a fixed temperature, for example - consider 2 reactions A and B, now if low temperature for reaction A is 400 Kelvin, then it is certainly possible that for reaction B low temperature is say 800 Kelvin.