Number 85

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[Chemistry]  The atomic number of Astatine (At).

 

[Library]  ISBN-85 is the International Standard Book Number for books published in Brazil.

 

[Math.]  854 = 52,200,625 = (52+20+06+2+5)4

8510 = 19,687,440,434,072,265,625 =

 = (1+9+6+8+7+4+4+0+4+3+4+0+7+2+2+6+5+6+2+5)10.

 

[Math.]  A number that can be sum of 2 different square numbers in 2 ways:

85 = 62+72 = 22+92.

 

[Math.]  A regular polygon with this odd number (product of Fermat prime numbers) of sides is constructible by using only straightedge and compass. 85 = 5´17.

 

[Math.]  1+2+…+645 = 12+22+…+852 = 208,335.

 

[Sport]  The size of an ice hockey rink: 200 feet long & 85 feet wide (or 61 meters long and 25.9 meters wide).

 

[Tech.]  The loudest volume (measured in decibels) a person's ear can handle without risking permanent damage is known as 85 decibels.

 

[Tech.]  The numbers of automobile gear oil SAE viscosity: 75W, 80W, 80W-90, 85W, 90W and 140W.

 

[Tech.]  E-85, a kind of fuel for alternative fuel vehicles, is a blend of 85% ethanol and 15% gasoline.