Water vapor is present in a proportion of 2 percent in the atmosphere.
Water vapor averages around 5,000 ppm or around 0.5 percent. Often people will write that because water vapor varies between zero and 4%, the average is 2%. But the average is much lower.
36 posted on 11/02/2017 4:04:47 PM PDT by palmer
(...if we do not have strong families and strong values, then we will be weak and we will not survive)