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2. History of manufactured fuel gases - Wikipedia

   en.wikipedia.org/wiki/History_of_manufactured...

   Enterprising gas-works engineers discovered that bog iron ore could be used to remove the sulfuretted hydrogen from the gas, and not only could it be used for such, but it could be used in the purifier, exposed to the air, whence it would be rejuvenated, without emitting noxious sulfuretted hydrogen gas, the sulfur being retained in the iron ore.

3. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   Air purifier. An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke.

4. Air ioniser - Wikipedia

   en.wikipedia.org/wiki/Air_ioniser

   An air ioniser (or negative ion generator or Chizhevsky's chandelier) is a device that uses high voltage to ionise (electrically charge) air molecules. Negative ions, or anions, are particles with one or more extra electrons, conferring a net negative charge to the particle. Cations are positive ions missing one or more electrons, resulting in ...

5. Combustibility and flammability - Wikipedia

   en.wikipedia.org/wiki/Combustibility_and...

   Combustibility and flammability. A combustible material is a material that can burn (i.e., sustain a flame) in air under certain conditions. A material is flammable if it ignites easily at ambient temperatures. In other words, a combustible material ignites with some effort and a flammable material catches fire immediately on exposure to flame.

6. Gas stove - Wikipedia

   en.wikipedia.org/wiki/Gas_stove

   A gas stove is a stove that is fuelled by combustible gas such as natural gas, propane, butane, liquefied petroleum gas, syngas, or other flammable gas. Before the advent of gas, cooking stoves relied on solid fuels such as coal or wood. The first gas stoves were developed in the 1820s and a gas stove factory was established in England in 1836.

7. Samsung Electronics - Wikipedia

   en.wikipedia.org/wiki/Samsung_Electronics

   Samsung Electric Industries was established as an industrial part of Samsung Group on 13 January 1969 in Suwon, South Korea. [17] At the time, Samsung Group was known to the South Korean public as a trading company specialized in fertilizers and sweeteners. Despite the lack of technology and resources, falling shorter even than the domestic ...