helium-bearing natural gas
21Titanium — This article is about the chemical element. For other uses, see Titanium (disambiguation). scandium ← titanium → vanadium …
22energy conversion — ▪ technology Introduction the transformation of energy from forms provided by nature to forms that can be used by humans. Over the centuries a wide array of devices and systems has been developed for this purpose. Some of these energy …
23Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …
24Cryogenics — For cryopreservation/resuscitation, see Cryonics. For the band, see Cryogenic (band). In physics, cryogenics is the study of the production of very low temperature (below −150 °C, −238 °F or 123 K) and the behavior of materials at those… …
25Radon — This article is about the chemical element. For other uses, see Radon (disambiguation). astatine ← radon → francium Xe ↑ Rn ↓ Uuo …
26Silver — This article is about the chemical element. For the color, see Silver (color). For other uses, see Silver (disambiguation). palladium ← silver → cadmium …
27Nickel — This article is about the chemical element. For other uses, see Nickel (disambiguation). cobalt ← nickel → copper ↑ Ni ↓ Pd …
28Rhenium — tungsten ← rhenium → osmium Tc ↑ Re ↓ Bh …
29AMC Gremlin — Infobox Automobile name = AMC Gremlin manufacturer = American Motors Corporation production = 1970 ndash; 1978 assembly = Kenosha, Wisconsin USA Brampton, Ontario, Canada Mexico City, Mexico (VAM) class = Subcompact body style = 3 door hatchback… …
30Refrigerator — Fridge and Freezer redirect here. For other uses, see Fridge (disambiguation) and Freezer (disambiguation). For other uses, see Refrigerator (disambiguation). See also: Refrigeration A side by side refrigerator …
