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2. Reducing atmosphere - Wikipedia

   en.wikipedia.org/wiki/Reducing_atmosphere

   Although Early Earth had a reducing prebiotic atmosphere prior to the Proterozoic eon, starting at about 2.5 billion years ago in the late Neoarchaean period, the Earth's atmosphere experienced a significant rise in oxygen and transitioned to an oxidizing atmosphere with a surplus of molecular oxygen (dioxygen, O 2) as the primary oxidizing agent.

3. Hypophosphorous acid - Wikipedia

   en.wikipedia.org/wiki/Hypophosphorous_acid

   HPA is usually supplied as a 50% aqueous solution and heating at low temperatures (up to about 90 °C) prompts it to react with water to form phosphorous acid and hydrogen gas. H 3 PO 2 + H 2 O → H 3 PO 3 + H 2. Heating above 110 °C causes hypophosphorous acid to undergo disproportionation to give phosphorous acid and phosphine. [7] 3 H 3 PO ...

4. Oxidizing and reducing flames - Wikipedia

   en.wikipedia.org/wiki/Oxidizing_and_reducing_flames

   Reducing, neutral and oxidizing oxyacetylene flames. A flame is affected by the fuel introduced and the oxygen available. A flame with a balanced oxygen-fuel ratio is called a neutral flame. The color of a neutral flame is semi-transparent purple or blue. [1] This flame is optimal for many uses because it does not oxidize or deposit soot onto ...

5. Flame arrester - Wikipedia

   en.wikipedia.org/wiki/Flame_arrester

   A flame arrester during testing A flame arrester made for a 91 cm (36 inch) pipe weighing 10 tons. A flame arrester (also spelled arrestor), deflagration arrester, [1] or flame trap [2] is a device or form of construction that will allow free passage of a gas or gaseous mixture but will interrupt or prevent the passage of flame.

6. HAZMAT Class 2 Gases - Wikipedia

   en.wikipedia.org/wiki/HAZMAT_Class_2_Gases

   A gas is a substance which (a) at 50 °C (122 °F) has a vapor pressure greater than 300 kPa (43.51 PSI) or (b) is completely gaseous at 20 °C (68 °F) at a standard pressure of 101.3 kPa (14.69 PSI). Gases are assigned to one of three divisions division 2.1 Flammable gas; division 2.2 Non flammable, Non-toxic gas; division 2.3 Toxic gas

7. Hexamine fuel tablet - Wikipedia

   en.wikipedia.org/wiki/Hexamine_fuel_tablet

   Esbit brand hexamine tablets. A hexamine fuel tablet (or heat tablet, Esbit) is a form of solid fuel in tablet form. The tablets burn smokelessly, have a high energy density, do not liquefy while burning and leave no ashes.