lyadalachanc

Ok... but I need less obvious variables. For example, maybe something to do with the absorption spectra of the material?

I don't understand how the interior of a material is related to the ratio of the surface area to the volume of a sphere. Wouldn't the shape of the material also need to be a sphere then? Except this, everything else makes sense, thx!

I am doing an experiment which involves starting a fire with a magnifying glass. I need help in coming up with what variable I should vary. So far I have come up with absorptivity of the material, light source, the color of the light source, and also the environmental factors (humidity, altitude, oxygen levels etc.). What are some other possible variables for the burning glass experiment?

Studiot, I understand the equation, just not the derivation of it. How was the equation derived

According to Wikipedia, the autoignition is defined as: What is the derivation of this equation? Is there even a derivation?