Comments by "David Ford" (@davidford3115) on "John Michael Godier" channel.

@unvergebeneid Let us also put some context which I wish the video would have acknowledged. The reason why at the surface Venus is so efficient at distributing energy is that at 90 atmospheres, CO2 acts NOT as a gas, but as a liquid. At that the Temps on Venus a supercritical fluid at that. A liquid is better and conduction and convection(advection) of energy transfer than a gas. The change-over point for CO2 from super-critical liquid to gas is 70 atmospheres which is about 5km above the surface. So in a sense, Venus has a 5km deep ocean of liquid CO2. Now I don't disagree that much of that may have been locked up in the Venusian Mantle at one time. So a question that arises is at what partial-pressure value does CO2 create this "runaway greenhouse effect"? If we want to do a proper analogy of atmospheric conditions to Earth, we have to go up to 50km altitude where the pressure is 1 atmosphere (about 1000 mb) At 1 bar, the temperature of Venus is 131 Fahrenheit(55 Celsius). The hottest natural temperature recorded on Earth was Death Valley and registered 121 F(49.4C). When you go up to 500mb (1/2 atmospheric pressure), the Temperature drops to 70F (21C). This temperature change in temperature to pressure is consistent with the Ideal Gas Law in physics. Water Vapor in Earth's atmosphere changes the dynamics. If you were to evaporate water into Venus's atmosphere, the temperature would drop drastically due to latent heat absorbed by vaporization of the water. Not even Death Valley at its hottest is as dry as Venus. Just some food for thought.
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