Most people bring oxygen tanks with them because of the high altitude and the thinness of the air (the oxygen at the top of Mount Everest is about 1/3 that it is at sea level). But a very few people have made it to the top without them.
if you are in need of a gas mask, you BP isn't an issue. the mask may inhibit your ease breathing but it will not directly affect your BP.
You needed to take a gas mask in case their was a gas attack.
Gas mask was created in 1914.
you need to get it a gas mask
Gas masks were gradually developed in the 1800s and the exact year you need is in the link below.
I think it stopped gas getting in the mask...
A person wearing a gas mask.
Click on the blue shirt in the top right corner. Then click on the mask, but you don't need it.
A gas mask is used to filter out toxic agents in the air.
M65 Gas Mask.
The main part of the gas mask is made out of rubber.
At high altitudes, such as on Mount Everest there is less air above you. This means that the density and pressure of air decreases as altitude increases. Each intake of air on Mount Everest has only one-third of the gas molecules-including oxygen-that would be present at sea level.