Crown height7.5 thousandths m
13.4 millionSalt crystals
300Pollen grain widths
Photo from Wikimedia Commons
Human Molar Tooth
The broad grinding tooth at the back of the jaw/The Human Body
Molar teeth have broad, flat crowns designed for grinding food. Adults have 12 molars including four wisdom teeth. The enamel covering a molar is the hardest substance in the human body, roughly as hard as steel on the Mohs scale.
Measurements
Crown width (buccolingual)1.1 hundredths m
11 billionGamma ray wavelengths
440Pollen grain widths
3 thousandthsKayaks
Crown length (mesiodistal)1 hundredths m
1.4 thousandthsSoccer goal widths
12.5 billionthsFlorida lengths
1.9 tenthsGolf tees
Root length1.3 hundredths m
839 millionthsSubway cars
2.4 thousandthsParking space lengths
Mass2 thousandths kg
20 trillionthsAircraft carrier masses
20 billionPlatelet weights
Enamel thickness2.5 thousandths m
5.6 thousandthsNecklace lengths
758 millionthsAfrican elephant heights
8.3 tenthsSesame seeds