![]() The temperature of Barsoom ranges from hot during the day to cold at night. This implies that despite claims to the rarity of the Barsoomian atmosphere, so long as you remain under a mile of the surface, there is little difference between Earth and Barsoom as to air composition or pressure. Neither do the local inhabitants show no sign of overly develo ped rib cages to ho use expanded lung s. Yet, Earthmen can breathe and exercise easily on Barsoom from their first moment of arrival with no difficulty. When the Olympics are situated in Mexico City or Denver, athletes arrive at least a month ahead to get used to the thin air, to build their red count and to adapt to the lesser air pressure before they even attempt serious exercise. (note: Mt Everest at 29,028 feet or almost 5 miles has an air pressure of 4.4 psi which is almost 400 times the thickness of the air at the surface of Mars) T ry to do your morning three mile run the day after you arrive and see how far you get. To understand this, Go from Miami, Florida (at sea level 14.5 psi) to Denver Colorado (a mile high 12.5 psi) and see how easily you can breathe. There simply isn't enough free oxygen on Mars to keep a person alive. If somehow you could concentrate the air into something equal to near Earth pressure, you would still die within minutes from Carbon Dioxide poisoning which causes the blood to become alkaline. Appearing there suddenly would suck your lungs from your chest almost instantly. 15 psi (about 1/100th of Earth) with a composition of mainly Carbon Dioxide (CO2). Mars, however, has an atmospheric pressure of. ![]() Therefore, the atmospheric pressure and composition was similar to that of Earth near 2000 feet altitude in the case of John Carter (the Superstition Mountains where John Carter is presumed to be gold hunting starts at about 2400'). We know the air pressure and composition because both John Carter and Ulyssus Paxton were transported from Earth (14.5 pounds per square inch air pressure with a 75% Nitrogen and 25% Oxygen content) to Barsoom and could not only breathe easily upon arrival but could do so after considerable and immediate exercise. We know the size because Burroughs received these measurements from John Carter. Barsoom is a world about 4,222 miles (6,787 km) in diameter and 13,257 miles (21, 311 km) in circumference with an atmosphere breathable by any earth person without difficulty or trouble. ![]()
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