Correction for the weight of a Playing Card
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How heavy is 0.00000000000250 megatonnes?
It's about one-and-two-fifths times as heavy as a Playing Card
The weight of a Playing Card is about 0.00000000000180 megatonnes.
(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 0.00000000000180 megatonnes. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.