Explain what happens when you continually heat a solid in terms of particle motion and state of matter.

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask