What is coal? Coal is a fossil fuel and is the altered remains of prehistoric vegetation that originally accumulated in swamps and peat bogs. The energy we get from coal today comes from the energy that plants absorbed from the sun millions of years ago. All living plants store solar energy through a process known as photosynthesis.
Dynamic equilibrium. Definition. noun. A system in a steady state since forward reaction and backward reaction occur at the same rate. Supplement. In a dynamic equilibrium, the rate of loss is equal to the rate of gain. Dynamic equilibrium is applied in thermodynamics for systems involving reversible reactions.
11.6 Phase Diagrams. The equilibrium between a liquid and its vapor is not the only dynamic equilibrium that can exist between states of matter. Under appropriate conditions of temperature and pressure a solid can be in equilibrium with its liquid state or even with its vapor state. A phase diagram is a graphical way to summarize the conditions under which equilibria exist between the different states of matter.