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ORC PHYSICS A FORCES FIELDS EN
THERMAL PHYSICS
5
Physics
05/27/2008

Term
 what is a change of state?
Definition
 this is when a solid becomes a liquid and a liquid becomes a gas.when a solid melts some intermolecular bons are broken so the molecules a re more dissordered and more free to move.when a liquid becomes a gas the particles become more dissordered, further apart and faster moving as all of the intermolecular bonds have been broken
Term
 how does the energy change a s a block of ice is melted?
Definition
 the ice starts below 00C, the molecules gain energy and vibrate more.at 00C the ice is melting and the potentional energy (PE) is increasingas the temp increases the ice becomes water, the molecules mover more quickly and their kinetic energy (KE) is increasing.at 100oC the water is boling and the molecules become more separate increasing the PEfurther heating leads to their KE increasing as the molecules are moving even faster.
Term
 what is the internal energy?
Definition
 the internal energy of a system is the sum of the randomly distributed kinetic and potentional energies of its molecules.
Term
 what is the specific heat capacity?
Definition
 the specific heat capacity of a substance is numerically equal to the amount of energy required to raise the temperature of 1kg of the substance by 1 KΔQ = mcΔθ
Term
 what is the specific latent heat?
Definition
 the specific latent heat of a substance is numerically equal to the energy that must be supplied to change the state of 1 kg of the substance without any change in temperature.ΔQ = mL
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