We can see objects that measure slightly less than one millimeter with the naked eye, but we must use certain apparatuses to see detail. The first tool designed for this purpose was likely a magnifying glass.
The invention of the microscope occurred in the 16th century. Optical microscopes consist of a hollow, brass tube with an eyepiece lens at one end and an objective lens at the end closest to the specimen. This kind of microscope can enlarge images up to 2,000 times.
These microscopes work similar to optical microscopes except that the beam of light is a beam of electrons and the focal lenses are magnetic fields that alter trajectory. We can see things that are tens of millions of times smaller than a millimeter with these devices.
An atom has a diameter 10 million times smaller than a millimeter. It consists of a central nucleus and a few electrons. Electrons must be able to jump easily from one atom to another to form new molecules.
This segment reviews the concepts of atoms discussed in this video.
Credits: Voyage to the Heart of Matter
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A voyage into the smallest "universe" imaginable: the atom. This program will explore the world of atoms, the subatomic world, and quarks, which are the basic building blocks of all matter. It will also cover the magnifying glass, optical microscope, and tunnel-effect microscope.
Length: 17 minutes
Copyright date: ©2013
Prices include public performance rights.
Not available to Home Video, Dealer and Publisher customers.
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