Length1.5 m
1.41Hurdle heights
500 millionthsAirport runway lengths
136Shirt buttons
Standard adult bathtub
Photo from Wikimedia Commons
Standard Bathtub
150 liters of questionable life decisions and rubber ducks/Everyday Objects
A standard bathtub holds about 300 liters of water (0.3 cubic meters), weighs roughly 80 kg empty if made of cast iron or acrylic, and is about 1.5 meters long. Bathtubs have been around since at least 1700 BCE — the Minoans had them in Crete. Archimedes famously had his eureka moment in one, discovering the principle of buoyancy and allegedly running through the streets of Syracuse naked.
Measurements
Water capacity3 tenths m³
6 millionRaindrops
1 trillionPollen grain volumes
About 300 liters when full
Empty weight (cast iron)80 kg
160 billionParamecia
13.3 billionthsGreat Pyramids of Giza
Cast iron tub; acrylic ones weigh much less
Width7 tenths m
9.46Baseball diameters
3.5 hundredthsWindmill heights
1.94Hip widths
About 70 cm wide
Depth4 tenths m
7.02House keys
3.7 tenthsHurdle heights
1.33Lily pad diameters
About 40 cm deep
Weight when full of water380 kg
126,667Hummingbirds
380 trillionSkin cells
Empty tub plus 300 kg of water