Difference between revisions of "Sizes of things"
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| − | + | == Cells == | |
| − | |||
*10<sup>14</sup> (100 trillion) [[w:Cell (biology)|cells]] in the Human body | *10<sup>14</sup> (100 trillion) [[w:Cell (biology)|cells]] in the Human body | ||
*A typical cell size is 10μm, (0.01mm) some [[w:pollen|pollen]] is a bit smaller than that but is made of several cells. The [[w:Cell membrane|cell membrane]] (wall) is about 10nm thick for animals cells. | *A typical cell size is 10μm, (0.01mm) some [[w:pollen|pollen]] is a bit smaller than that but is made of several cells. The [[w:Cell membrane|cell membrane]] (wall) is about 10nm thick for animals cells. | ||
| − | * | + | *The [[w:cell nucleus|cell nucleus]] is 11-22μm and is typically about 10% of the total volume, so the cell would have to be about 50-100μm. Typical mammalian cell nucleaus has 3000-4000 pores of 100nm diameter. |
| + | *Animal cells are on the borderline of visibility, they can be seen but only as a spec of dust. | ||
| + | <table><tr> | ||
| + | <td>[[Image:Endomembrane system diagram.png]] | ||
| + | <td valign=top>[[Image:E-coli.jpg]]<br>''E-coli single-cell organisms'' | ||
| + | </table> | ||
| + | |||
| + | ''Human cell with nucleus, about 30,000 atoms in diameter, the pores are about 200 atoms diameter, the ribosomes about twice that'' | ||
| + | |||
| + | == Planets and stars == | ||
| + | [[File:Sizes of planets and stars.jpg]] | ||
| + | |||
| + | == Atoms == | ||
| + | *The [[w:angstrom|Angstrom]] is 0.1nm and is roughly the size of a typical atom (0.5A for Hydrogen to 3.8A for Uranium). | ||
| + | *The distance between carbon atoms in β sheets in enzymes etc is roughly 5A (0.5nm). | ||
| + | *This would make the cell nucleus in the region of 30,000 atoms diameter, and the animal cell 150,000 atoms. | ||
| + | *The pores on the nucleus would have about 600 atoms around their opening. | ||
| + | |||
| + | == Astronomy learning resources == | ||
| + | *[http://www.discoveryeducation.com/search/page/-/-/lesson-plan/space/index.cfm Astronomy Lesson Plans] | ||
| + | *[http://www.ellejet.com/jets-observing-the-skys.php Educational and Fun Astronomy Games] | ||
| + | *[http://www.planetsforkids.org/ Planets for Kids: Solar System Facts and Astronomy] | ||
| + | *[http://blog.zintro.com/space-exploration/ Space Exploration Insights & Resources] | ||
| + | *[http://www.exploratorium.edu/eclipse/links.html Exploratorium - Eclipse Links and Resources] | ||
| + | *[http://educatorlabs.org/resources/listing-category/astronomy/ Astronomy Resource Bank] | ||
| + | |||
| + | == See also == | ||
| + | *[[Physics]] | ||
| + | *http://learn.genetics.utah.edu/content/begin/cells/scale ''- excellent simulation with sliding scale'' | ||
| + | *http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10 | ||
| + | *http://www.mpibpc.mpg.de/groups/de_groot/presentations/Madrid2003/aqp1_system_movie.html ''- this is an unbelievable simulation of how water molecules are transmitted thru a membrane. this clip actually happens in ''10 ns''! | ||
| + | *[http://primaxstudio.com/stuff/scale_of_universe/ Scale of the universe with pictures and words] | ||
| + | *[http://htwins.net/scale2/ The Scale of the Universe 2] | ||
| + | |||
| + | [[Category:Physics]] | ||
Latest revision as of 22:18, 7 August 2021
Cells
- 1014 (100 trillion) cells in the Human body
- A typical cell size is 10μm, (0.01mm) some pollen is a bit smaller than that but is made of several cells. The cell membrane (wall) is about 10nm thick for animals cells.
- The cell nucleus is 11-22μm and is typically about 10% of the total volume, so the cell would have to be about 50-100μm. Typical mammalian cell nucleaus has 3000-4000 pores of 100nm diameter.
- Animal cells are on the borderline of visibility, they can be seen but only as a spec of dust.
|  E-coli single-cell organisms |
Human cell with nucleus, about 30,000 atoms in diameter, the pores are about 200 atoms diameter, the ribosomes about twice that
Planets and stars
Atoms
- The Angstrom is 0.1nm and is roughly the size of a typical atom (0.5A for Hydrogen to 3.8A for Uranium).
- The distance between carbon atoms in β sheets in enzymes etc is roughly 5A (0.5nm).
- This would make the cell nucleus in the region of 30,000 atoms diameter, and the animal cell 150,000 atoms.
- The pores on the nucleus would have about 600 atoms around their opening.
Astronomy learning resources
- Astronomy Lesson Plans
- Educational and Fun Astronomy Games
- Planets for Kids: Solar System Facts and Astronomy
- Space Exploration Insights & Resources
- Exploratorium - Eclipse Links and Resources
- Astronomy Resource Bank
See also
- Physics
- http://learn.genetics.utah.edu/content/begin/cells/scale - excellent simulation with sliding scale
- http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10
- http://www.mpibpc.mpg.de/groups/de_groot/presentations/Madrid2003/aqp1_system_movie.html - this is an unbelievable simulation of how water molecules are transmitted thru a membrane. this clip actually happens in 10 ns!
- Scale of the universe with pictures and words
- The Scale of the Universe 2
