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2. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power. There are also heaters that use several single-phase circuits instead.

3. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   A furnace ( American English ), referred to as a heater or boiler in British English, is an appliance used to generate heat for all or part of a building. Furnaces are mostly used as a major component of a central heating system. Furnaces are permanently installed to provide heat to an interior space through intermediary fluid movement, which ...

4. 2 + 2 + 1 = Ponderosa Twins Plus One - Wikipedia

   en.wikipedia.org/wiki/2_+_2_+_1_=_Ponderosa_Twins...

   Producer. Bobby Massey, Michael Burton. Singles from 2 + 2 + 1 = Ponderosa Twins Plus One. "You Send Me". Released: 1971. "Bound". Released: 1971. 2 + 2 + 1 = Ponderosa Twins Plus One is the only album by American vocal group Ponderosa Twins Plus One, released in 1971 through Horoscope Records. The album was produced by Bobby Massey of the O ...

5. Natural gas - Wikipedia

   en.wikipedia.org/wiki/Natural_gas

   Natural gas. Natural gas (also called fossil gas, methane gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane (97%) [1] in addition to various smaller amounts of other higher alkanes. Traces of carbon dioxide, nitrogen, hydrogen sulfide, and helium are also usually present. [2]

6. Toomre's stability criterion - Wikipedia

   en.wikipedia.org/wiki/Toomre's_Stability_Criterion

   Toomre's stability criterion. In astrophysics, Toomre's stability criterion (also known as the Safronov–Toomre criterion) is a relationship between parameters of a differentially rotating, gaseous accretion disc which can be used to determine approximately whether the system is stable. In the case of a stationary gas, the Jeans stability ...

7. Water–gas shift reaction - Wikipedia

   en.wikipedia.org/wiki/Water–gas_shift_reaction

   This is sometimes called the reverse water–gas shift reaction. Water gas is defined as a fuel gas consisting mainly of carbon monoxide (CO) and hydrogen (H 2). The term ‘shift’ in water–gas shift means changing the water gas composition (CO:H 2) ratio. The ratio can be increased by adding CO 2 or reduced by adding steam to the reactor.