Question

people going for traking in high altidudes oxygen cylinders at their back. why do they cary that?​

Answer 1

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Answer 2

Answer:

Sea divers carry oxygen gas cylinders along with them because there is no free oxygen in the sea water since the little dissolved oxygen present in water can't be used for breathing by divers. It can be used only by aquatic animals.

At real altitude, the barometric pressure of the atmosphere is significantly less than that of sea-level environments. The result is that oxygen molecules in the air are further apart, reducing the oxygen content of each breath incrementally as one goes up in altitude.