Fermi Reference Values (Bio)

All fermi reference values that can be used to either directly answer a fermi question or aid in calculating an answer to a fermi question. This flashcard set specifically focuses on common biology measurements.

Average Human Lifespan (years)

77\.3 years

Average Human Lifespan (days)

28200 days

Average Human Lifespan (hours)

6\.78e5 hours

Average Human Lifespan (seconds)

2\.44e9 seconds

Human Body - Atoms

6\.50e27 atoms

Human Body - Mass

80 kg

Human Body - Volume

65 L

Human Body - Surface Area

1\.8e4 cm^2

Blue Whale - Mass

1\.00e6 kg

Total Humans

8\.00e9 people

Burnt Calories - Sitting (kCal/hr)

100 kCal/hr

Calories - Big Mac

563 kCal

Volume of Air in One Breath

0\.5 L

Volume of Air in One Lung

6 L

Volume of Air Inhaled Per Day

1\.00e4 L

Human Cells

3\.00e13 cells

Bacterial Cells in Human

3\.80e13 cells

Red Blood Cells in Human

2\.50e13 cells

RBC Rate

2\.50e6 cells/s

Hemoglobin/RBC (cells/s)

2\.80e8 cells/s

Total Joints in Human Body

360 Joints

Volume of Human Blood

5 L

Radiation - Banana

1\.00e-7 Sv

Radiation - Chest X Ray

1\.00e-5 Sv

Radiation - US Artificial Limit

1\.00e-3 Sv

Radiation - Instant Death

5-10 Sv

Diameter - Human Cell

1\.00e-4 m

Diameter - Virus

1\.00e-7 m

DNA - One Human Cell

2 m

DNA - Total

0\.05-0.06 kg

Cells - Human

3\.00e13 m

Total Muscles in Human Body

600 Muscles

Lung Surface

70 m^2