describe external micrometer?
368735
It's just a micrometer that measures the outside diameter or length of an object whereas an internal micrometer measures the inside diameter of objects such as a hollow tube.  For example, if you had some PVC pipe in your house and had to replace a section, you would measure the outside diameter with an external micrometer and the inside diameter of the tube with an internal micrometer before going to Home Depot to make a purchase.  Hope this helps.
743124
It depends on how precise you need to be.\n\nIf you're looking for a rough estimate a micrometer or caliper would be fine, though they will always underestimate the thickness since the paper will distort under the pressure of the instrument.\n\nIf you can assume that your piece of paper is of uniform thickness (and you have many pieces) you can measure the stack and divide by the number of sheets.  If you only have one piece you can fold it into a stack, measure that thickness and divide by the number of folds.  \n\nIf this is only a hypothetical question or you have some money to spend there are laser micrometers that can measure the thickness of transparent or semi-opaque films down to a few microns.
906177
compound light microscope
718771
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is commonly used in nanotechnology, the building of extremely small machines.
942750
its a measuring instrument to measure the outer dimensions (inner also)of objects,usually at an accuracy of 0.01mm ,also called micrometer.\nthe main part of instrument is a screw and the pitch of the screw will be .5 mm for a .01mm least count screw gauge. and one rotation of the screw is marked  into 50 divisions.\none drawback of screw gauge is the zero error.\ndue to backlation but which can be easily corrected. there are digital micrometers also in the industry now
93031
Check this out...\n\nhttp://home.inter.net/eds/paper/inchmetric.html
387203
1) Measureing the height of ants in order to fit them out in a    tuxedo for the beetles wedding\n2) Disprove that individual atoms can be measured by using a micrometer (the best experiments sometimes don't support a theory but disprove it)\n3) Measuring toilet paper thickness to see if soft and thick is better than thin and strong.\n\nSafety when using a micrometer is paramount. Never, ever put your head inside the jaws of a micrometer unless it is less than the width of the jaws.
88021
Using a set of callipers if the droplet is large enough. If not then using an eyepeice micrometer and a microscope.
917442
its a lens to a microscope
739529
microscope\nsalt is pyramid shaped.
750219
Milliliter\n\nKilogram
791949
magnification = apparent size/actual size\n\nso actual size = apparent size/magnification.\n\nso if it appears to be 8mm under your microscope,\nactual size = (8/1000) mm\n                  = 8 micrometres or microns.
188870
a scale or balence that uses grams
1004865
Nanotechnology is a catch-all phrase for materials and devices that operate at the nanoscale. In the metric system of measurement, “Nano” equals a billionth and therefore a nanometer is one-billionth of a meter. References to nano materials, nanoelectronics, nano devices and nanopowders simply mean the material or activity can be measured in nanometers. To appreciate the size, a human red blood cell is over 2,000 nanometers long, virtually outside the nanoscale range!\n \n  \n \nRecently, government and private institutions have devoted substantial research into finding potential valuable uses at this scale, as discussed below.
135532
You can either look it up or determine it experimentally.\nI cant get much more specific without additional details.
358092
Check the Omega online catalog. They have an extensive supply of measuring devices for lab, process, and manufacturing uses. Customer service is top notch.\n\nwww.omega.com
491288
10^3 milligrams\n10^6 micrograms\n10^9 nanograms  \n10^12 picograms \n10^15 femtograms \n10^18 attograms \n10^21 zeptograms \n10^24 yoctograms