Explain the gas test for oxygen

A blood oxygen level test, also known as a blood gas analysis, measures the amount of oxygen and carbon dioxide in the blood. When you breathe, your lungs take in (inhale) oxygen and breathe out (exhale) carbon dioxide. If there is an imbalance in the oxygen and carbon dioxide levels in your blood, it can mean your lungs aren't working well.

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Light a splint, but let it sit for a while until it almost burns out. When it is glowing faintly, put the splint in the test tube with oxygen. The splint should start glowing and burning again. If it does, then oxygen gas is present and the test for oxygen is positive        Explanation:

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.