A. Because the heat of the earth can readily escape into the upper regions of the air, and is not confined and pent-in by thick clouds.
Q. Why do we feel depressed in spirits on a wet murky day?
A. 1st—Because when the air is laden with vapour, it has less oxygen.
2ndly—The air being lighter than usual, does not balance the air in our body: and
3rdly—Moist air has a tendency to relax the nervous system.
Q. What is meant by the “air balancing the air” in our body?
A. The human body is filled with air of the same density as that around: if, therefore, we ascend into purer air, or descend into denser air, the balance is destroyed, and we feel oppressed and suffocated.
Q. Why do we feel oppressed and suffocated if the air around is not of the same density as that in our body?
A. If the air around be more dense, it will squeeze our body in by its weight: if it be less dense, the air in our body will blow us out.