Correction for the size of a Hot Tub
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How big is 4,900,000 cubic meters?
It's about 7,000,000 times as big as a Hot Tub
The size of a Hot Tub is about 0.7190 cubic meters.
(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
An average, four-person hot tub holds 0.719 cu. m of water. Modern hot tubs became popular outside of Japan starting in about 1940.