Kinetic theory describes the arrangement and movement of particles in solids, liquids and gases. Particles in solids have the least kinetic energy and gas particles have the most energy. A gas can be condensed into a liquid by removing energy or increasing pressure.
Gliese 436 b is 439 degrees celsius, but strong gravity prevents the ice from melting.
Solid carbon dioxide (dry ice) will sublime at room temperature and pressure.
With a physical change, the form of matter is altered but one substance is not transformed into another.
Melted chocolate is still chocolate and evaporated water is still composed of water molecules, so these are physical changes.
Chemical changes involve the making or breaking of bonds between atoms to form new chemical substances.
The bonding of Hydrogen and Oxygen to form Water is explosive. The space shuttle rockets cause this bonding and the exhaust gasses are mainly water vapour.
Physical changes in matter are usually easier to reverse than chemical changes.
Glass sphere filled with a mixture of various noble gases, with a high-voltage electrode in the centre.
The energy ionises the gas as it jumps to a conductive object (like a hand). The ions are excited and loose energy, emitting photons (causing the visual effect).
The kinetic energy of an object is the energy it possesses due to its motion.
The potential energy of an object is the stored energy it possesses due to its position.
Both eggs will take the same amount of time to cook because the temperature of a substance (in this case water) does not change during a phase change (in this case from liquid to gas).