What are the effects of different air pressures?

Super odd that you chose to use 'in Hg' units.... How many feet do you think an air pressure of 29.42in Hg is at??

The colder it gets the more pressure you lose from your tires. And if you're a white collar male, that means you're far more likely to stop into my shop because your tire pressure light is on and you need help fixing it.

So at 760mmHg there is 159mmHg O2 in the air. You probably have 90-100mmHg in your arterial blood headed out to the tissues. If you took a bunch of deep breaths you could probably falsely pump that pressure of arterial O2 (PaO2) up.

Now you are 'high' at 747mmHg there is still 21@ O2 in the air... thus 156.8mmHg O2 in the atmosphere.... 98.6% of O2 is available to you as if you were at sea level.

Pretty darn close. The answer is probably one deep breath per minute but essentially nothing because 29.42in of Hg isn't high at all.

The air pressure here today is 30.35 close to sea level and will be going down below 30 in a week. I think normal at sea level is 29.92 unless I made a mistake.

I'm curious if it is generally easier to run when the pressure is higher than normal, normal, or lower than normal, and why.

Different air pressures wrote:

The air pressure here today is 30.35 close to sea level and will be going down below 30 in a week. I think normal at sea level is 29.92 unless I made a mistake.

I'm curious if it is generally easier to run when the pressure is higher than normal, normal, or lower than normal, and why.

Because there is a higher partial pressure of O2 in the atmosphere at higher temps. O2 is always 21% of the atmospheric pressure so that will rise and fall with barometric pressure.

@7000ft the pressure is 22.75 so x0.21= 4.78in Hg O2

(Less O2, train muscles to kick ass at lower altitudes.)

Sea Level 29.92 x0.21 = 6.28inHg O2 (MORE O2, easier to feed muscles)

33 feet under the ocean there is double the O2 there is at sea level.

(You probably cant run very fast down here)

I'm eagerly awaiting the real Hingle's answer.

Lower air pressures are Brady's preference,

and he is the greatest living American.

The listed values have pretty insignificant different effects.

If the air is cold and the atmospheric pressure is lower, it may take longer to warm up properly.

Yupppppers wrote:

Because there is a higher partial pressure of O2 in the atmosphere at higher temps. O2 is always 21% of the atmospheric pressure so that will rise and fall with barometric pressure.

@7000ft the pressure is 22.75 so x0.21= 4.78in Hg O2

(Less O2, train muscles to kick ass at lower altitudes.)

Sea Level 29.92 x0.21 = 6.28inHg O2 (MORE O2, easier to feed muscles)

33 feet under the ocean there is double the O2 there is at sea level.

(You probably cant run very fast down here)

Thanks very much. Does that mean there was 30.35 x .21 = 6.3735inHg O2 today? How much would that help, or would it be insignificant?

Different air pressures wrote:

Yupppppers wrote:

Because there is a higher partial pressure of O2 in the atmosphere at higher temps. O2 is always 21% of the atmospheric pressure so that will rise and fall with barometric pressure.

@7000ft the pressure is 22.75 so x0.21= 4.78in Hg O2

(Less O2, train muscles to kick ass at lower altitudes.)

Sea Level 29.92 x0.21 = 6.28inHg O2 (MORE O2, easier to feed muscles)

33 feet under the ocean there is double the O2 there is at sea level.

(You probably cant run very fast down here)

Thanks very much. Does that mean there was 30.35 x .21 = 6.3735inHg O2 today? How much would that help, or would it be insignificant?

Insignificant, given that partial pressure of oxygen in your blood is dynamic, you make necessary changes subconsciously.