Tube furnace, a Common card

A tube furnace is an electric heating device used to conduct syntheses and purifications of inorganic compounds and occasionally in organic synthesis.
From the Wikipedia article

Rarity: Common
Domain: Science
ATK: 47
DEF: 21
Power: 68
Wikipedia reads a year: 4,700

Ranked #2,956 of the 3,000 cards of the base set by power (ATK + DEF).

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The facts on the card

The card carries these facts from its Wikipedia article.

One possible design consists of a cylindrical cavity surrounded by heating coils that are embedded in a thermally insulating matrix.
Temperature can be controlled via feedback from a thermocouple.
More elaborate tube furnaces have two heating zones useful for transport experiments.

Why it is Common

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Tube furnace article was read about 4,700 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 47 and blocks with 21: each hit it takes is cut by 8 %.

How to get Tube furnace

Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.

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Cards close in power

The cards just above and just below Tube furnace in the power ranking, all domains together.

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Credits

Text : Wikipedia, Tube furnace (revision), CC BY-SA 4.0. Photo : Manuel Almagro Rivas, CC BY-SA 4.0, Wikimedia Commons.