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|How Big Are Things?
|micrometer's Room - looking at a sheet of graph paper|
|look at the entire room||
bacteria ~1 um red blood cell ~10 um
hair ~100 um diameter
Looks like a tree trunk?
paramecium Source, image "Courtesy of Sidney Tamm".
(Looks odd? I wonder if it's dead and dried out.)
src q-tip cotton
Looks like twigs?
a bacteria "train" from my mouth
your screen dot
... most Prokaryotic cells
... most Eukaryotic animal cells
human red blood cell
capillary blood vessel
... rbc's fit through because they are squishy.
Hmm... another source claims 8-10 um...?
|alveoli wall (~300um balloon)||if you were inside the alveoli, it would look somewhat like being in those big theaters here with the round roofs, and you can look up and you can see sort of a tiled effect? That's kind of what you might imagine. You'll see these cells that are attached together much like tiles are on a floor. src[edited]|
Saran wrap (kitchen plastic wrap)
thin aluminum foil (used in laminates)
typical kitchen foil
typical aluminum tray
thick aluminum foil (thicker than 200 um is called "sheet" rather than "foil" :)
pin head (size approximate ±~15%) source, img
... amoeba cyst src
... sneeze droplets src
: ... ... yeast src
|corner of a grain of salt|
single optical fiber (no coating) src
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