Those are incompatible (non-convertable) units: Feet is a measure of length, atmospheres is a measure of pressure.
Two atmospheres is 67.8 feet of water.
3 atmospheres
751.5 mmHg = 0.9888 atmospheres
For each 33 feet of depth in water the pressure increases approximately 1 atmosphere. So 100 meters is approximately 330 ft divide by 33 equals 10 atmosphere.
10
10 atmospheres is about 340 feet of water depth.
Two atmospheres is 67.8 feet of water.
660 feet
It means 10 atmospheres. This usually indicates a watch will remain waterproof to a depth of 10 atmospheres or about 340 feet of water.
1,000atm is about 33,900 feet of water depth.
One foot is a unit of distance. One atmosphere is a unit of pressure (force per unit area). 10 atmospheres is equivalent to about 21,162 lb/ft^2 (pounds per square foot). At 339 feet under water, the pressure is approximately 10 atmospheres (assuming water density is 1000 kg/m^3).
3 atmospheres
About 335 feet.
50 feet of water is about 1.475 atmospheres.
990 ftAdditionApproximately 958 feet for 29 atmospheres of sea water and 1 atmosphere of surface air pressure.
This value is 0,9657895 atmospheres.
5,000 feet of water depth is about 147.5 atmospheres.