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Unformatted text preview: low mass particles) in
liquid move around erratically.
Being hit my molecules of liquid
Einstein made a prediction in 1905
calculated the rate at which grains should spread in liquid
Confirmed by new measurements 8 Heat and Gas Pressure
The atoms or molecules in a gas move freely around,
with constantly changing neighbors.
Pressure is caused by the atoms/molecules hitting the
wall of the container.
When heat a substance
molecules move faster giving increased pressure in gases
Solids and liquids expand
Temperature is a measure of the microscopic random
motion of molecules/atoms 9 Atoms Are Composite Objects •
• Protons (+ electric charge), p
Electrons (– electric charge), e
Neutrons (no electric charge), n
Proton and Neutron have about the same mass
and Neutron have
Electron is about 1800 times less massive than proton
Electrical Forces produce attraction between electrons
and the protons in the nucleus because they are
10 Chemical elements are defined by the number
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This note was uploaded on 01/31/2014 for the course BILD 3 taught by Professor Wills during the Winter '07 term at UCSD.
- Winter '07
- The Elegant Universe