Vantablack Pool
Vantablack pool would be cool. Or rather the opposite? I came across this meme The user "facts-i-just-made-up" makes an initial argument which seems quite reasonable. Black objects absorb the suns energy and radiate off heat. The things going beyond are a bit excessive. So... let's overthink this. How hot would a pool with Vantablack paint get? To answer this, let's build a playground example. Ignoring the sides of the pool allows us to simplify the problem to a 1m x 1m square of Vantablack paint. Above that, we have a water column of 2 meters. As water is very handily defined: 1m³ water is exactly 1000kg at 3.98°C. We want to know ballpark numbers and not go too crazy with it. So for further calculations we assume that our 2-meter column of water standing on the Vantablack square of 1m² at the bottom is 2000kg in mass at every temperature. So... how much energy do we have hitting the square? To be exact it's fairly complicated . Because I'm lazy let's tak...