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A change that alters the form or appearance of a material butdoes not convert the material
into new substances.
PHYSICAL CHANGE
Changes in state are physical changes
Image source: http://itl.chem.ufl.edu/2041_u99/lectures/lec_f.html
Every substance contains energy from the movement of its particles, called thermal energy. The higher the temperature of a substance, the greater its thermal energy.
The measure of the average energy of motion of the particles in a substance is
TEMPERATURE
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Matter changes whenever energy is added or taken away.
Energy is added: Solid Liquid Gas
Energy is removed: Gas Liquid Solid
Image source: http://cse.ssl.berkeley.edu/artemis/mission_sunearth_closeup1.html