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Heat and temperature
The electric and gravitational fields
Work and energy
Electricity and magnetism
Modern physics
Forces and pressure
Matter
Movement
Measure and scientific method
Waves
Optics
attraction among masses (I)
attraction among masses (II)
density
density (2)
density (calculations)
electric attraction
from large to small
mass has volume
matter causes gravity
matter has inertia
matter has mass
model of a gas
model of a liquid
model of a solid
model of the atom
Plasma
Matter