Arithmetic

Measurements

Internationl System of Units SI base unit Cell Size and Scale

Units

1 cm = 10-2 m
1 mm = 10-3 m
1 km = 103 m
1 nm = 10-9 m

Volue

cubic centimeters 1 cm3 = (10-2m)3 = 10-6 m3

Biology measurements Organic chemistry

Scale and Size

Name Size and Scale
coffee bean 12 x 8 mm
grain of rice 8 x 2.5 mm
sesame seed 3 x 2 mm
grain of salt 0.5 mm
amoeba proteus 500 µm
paramecium 210 x 60 µm
human egg 130 µm
skin cell 30 µm
photoreceptor (rod) 2.5 x 100 µm
sperm 60 x 5 µm
red blood cell 8 µm
X chromosome 7 µm
baker's yeast 3 x 4 µ
mitochondrion 4 x 0.8 µm
E. coli bacterium 3 x 0.6 µm
lysosome 1 µm
measles virus 220 nm
influenza virus 130 nm
hiv 130 nm
phage (bacteria virus) 70 x 200 nm
coated vesicle 50 nm
hepatitis virus 45 nm
rhinovirus 30 nm
ribosome 30 nm
antibody 12 nm
tRNA 7 nm
hemoglobin 6.5 nm
phospholipid 0.9 x 3.4 nm
adenine 1300 x 760 pm
methionine 1100 x 700 pm
glucose 900 pm
water molecule 275 pm
carbon atom 340 pm

Reference and Futher Reading

SEVENTH EDITION
CHEMISTRY
PRINCIPLES AND REACTIONS