This page explains the use of propane grills and how to check propane levels with pressure gauges. It covers volume-volume stoichiometry based on Avogadro's hypothesis, showing that equal gas volumes ...This page explains the use of propane grills and how to check propane levels with pressure gauges. It covers volume-volume stoichiometry based on Avogadro's hypothesis, showing that equal gas volumes under identical conditions contain equal particle numbers. An example illustrates calculating the required oxygen volume for propane combustion and the resultant carbon dioxide volume, highlighting the importance of keeping pressure and temperature consistent in gas volume considerations.