Answer: STP is a standard reference point of temperature and pressure, used when measuring gases. The universal value of STP is 1 atm (pressure) and 0o C. Note that this form specifically stated 0o C degree, not 273 Kelvin, even thought you will have to convert into Kelvin when plugging this value into the Ideal Gas equation or any of the simple gas equations. yes they are deal gases are those which follow ideal gas equation (which is PV=nRT).
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