Question

What is dry Oxygen?

Answer 1

Hint: Dry or wet Oxygen is based on the amount of moisture it contains. It is true for any other component whether an element or not. More moisture content, it will be considered wet. If the moisture content is low or negligible it will be considered dry.

Complete answer:
A dry Oxygen is obtained by passing the Oxygen gas over a tower containing drying agents like \[{\text{phosphorus pentoxide}}\] , fused \[{\text{calcium chloride}}\] or bubbling gas through \[{\text{sulphuric acid}}\] . Dry Oxygen is used in the oxygen delivery system for patients.
Dry Oxygen is heavier than the moist Oxygen since the vapour density of dry Oxygen is more than moist Oxygen .
Dry Oxygen is considered dry, based on the assumption that the moisture content is removed before the Oxygen measurement. Portable Oxygen analysers provide a dry Oxygen measurement.
Pure Oxygen is never wet, though it is a liquid at high pressure and low temperature but not wet. Not every liquid is wet. For example \[Mercury\] , which is a liquid but not wet. A wet Oxygen is based on the assumption that the moisture content in flue stream is not removed and is an element included when Oxygen content is measured.
When Oxygen is compressed in the tank, put the tank into liquid \[nitrogen\] to bring down the temperature to below \[ - {196^ \circ }C\] , then it will transform into a liquid. That liquid is used as a fuel in rockets. Dry and wet Oxygen is often used in rockets, as rockets with wet Oxygen in tanks are used as fuel and warm or dry oxygen is used in air.

Note:
Dry Oxygen is only found in pure form. It contains only water molecules and no impurities. They are made in laboratories. Whereas in wet Oxygen it has water content as well. Air is an example of wet Oxygen.