What range of colors
The main colors produced
by fireworks are yellow, orange, red, green and blue. Yellow is produced
emission. The other colors in fireworks are produced by a combination
of atomic emissions and molecular
When you heat a substance,
the heat energy can go into the electrons
of the atoms or molecules. The heat raises the energy of the electrons.
As they fall back to a lower energy they give off photons.
The energy of these photons, and hence their wavelengths, differs between
substances and so we see a range of colors.
Molecules have another
way of absorbing or radiating energy. Energy can be stored by the vibrations
of the different parts of the molecule. Whole atoms, or groups of atoms,
can vibrate relative to each other. The overall color that we see from
an excited substance is a combination of the atomic and molecular energy
changes. Red is the lowest-energy visible light, so in a red-hot object
the atoms are just getting enough energy to begin emitting light that
we can see. If you apply enough heat energy the electrons will generate
all the colors and appear white.
More about colors