 Only by doing it in a room thereby eliminating wind and convection and in a petrie dish (containing a tiny amount of water) which could not possibly have been prevented from receiving IR directly from the heat source and conducting it to the water. Holy cow, I somehow eliminated convection! Wow! Never mind that the heat gun has a fan in it that generates a significant wind that is easily visible on the surface of the water. Never mind that the relative humidity of that heated air was far lower than what is present at the ocean surface and therefore evaporation would be sped up. 