# Dissociation of H2O due to Photon energy.

by JJamison
Tags: dissociation, energy, photon
 P: 94 By absurd, was it on the order of $$10^{21}$$ kg? The Earth has $$1.36 * 10^{21}$$ kg of water, so having an answer that is similar or somewhat larger seems to make sense considering that there is hardly any water on Venus - 20ppm in the atmosphere. This also sets upper bounds, as the water could have been lost a long time ago, but the answer estimates the maximum amount of water Venus could have had when it was first formed to not have any water today. Rhetorical question: If we fast forward to 1 trillion years in the future (assuming that we can go that far), our answer would be $$10^3$$ larger, but would it be any more or less unreasonable? On the other hand, the title refers to dissociation rather than ejection of water. It is possible that some fraction would have recombined back into water.