Which element is heavier lead or flourine

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

What is the correct term for living the most sustainable life you can within your current circumstances?

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.