Atomic theory formula for the water molecule (HO), or 16 if one assumes the modern water formula (HO). The flaw in Dalton's theory was corrected in principle in 1811 by Amedeo Avogadro. Avogadro had proposed that equal volumes of any two gases, at equal temperature and pressure, contain equal numbers of molecules (in other words, the mass of a gas's particles does not affect the volume that it occupies). Avogadro's law allowed him to deduce the diatomic nature of numerous gases by studying the volumes at which they reacted. For instance: since two liters of hydrogen will react with just one liter
HAZMAT Class 2 Gases HAZMAT Class 2 Gases The HAZMAT Class 2 in United States law includes all gases which are compressed and stored for transportation. Class 2 has three divisions: Flammable (also called "combustible"), Non-Flammable/Non-Poisonous, and Poisonous. This classification is based on the United Nations' Recommendations on the Transport of Dangerous Goods - Model Regulations. In Canada, the "Transportation of Dangerous Goods Regulations", or TDGR, are also based on the UN Model Regulations and contain the same three divisions. A gas is a substance which Division 2.2: Non-Flammable, Non-Toxic Gas This division includes compressed gas, liquefied gas, pressurized cryogenic gas, compressed gas in