Effusion, an Uncommon card

The card carries these facts from its Wikipedia article.

• Such a hole is often described as a pinhole and the escape of the gas is due to the pressure difference between the container and the exterior.
• Under these conditions, essentially all molecules which arrive at the hole continue and pass through the hole, since collisions between molecules in the region of the hole are negligible.
• Conversely, when the diameter is larger than the mean free path of the gas, flow obeys the Sampson flow law.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Effusion article was read about 19,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 52 and blocks with 25: each hit it takes is cut by 10 %.

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.

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