How did Lord Kelvin determine the age of the sun?

Lord Kelvin determined the age of the sun by comparing the number of helium particles to the number of hydrogen particles in the sun. The sun’s heat is generated by the conversion of hydrogen atoms into helium atoms. Lord Kelvin knew how much heat is generated by the conversion of a given amount of hydrogen into a given amount of helium, how long that conversion took and the size of hydrogen and helium particles.By measuring the amount of heat the sun produces and the size of the sun, Lord Kelvin was able to determine how much of the sun is helium and how much of it is hydrogen.

This is how he determined the age of the sun. The calculation Lord Kelvin used to do this is this radiometric dating formula: D = D0 + N(eλt − 1) From Wikipedia.Com -quote The mathematical expression that relates radioactive decay to geologic time, is1013 D = D0 + N(eλt − 1) -endquote.

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