IB HL Physics - Thermodynamics Definitions

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8 Terms

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Internal Energy

The total energy contained within a system due to the motion of its particles, including kinetic and intermolecular potential energy of the molecules. Unit: Joules.

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Heat Transfer

Energy transferred as heat in a system due to a change in temperature. Notated as Q. Unit: Joules.

<p>Energy transferred as heat in a system due to a change in temperature. Notated as Q. Unit: Joules.</p>
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Specific Heat Capacity

The amount of energy required to raise the temperature of one kilogram of a substance by one degree Kelvin/Celsius. Notated as L. Unit: J kgā»1 Kā»1.

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Specific Latent Heat of Fusion

The energy release when one kilogram of solid goes through a phase change to become liquid. There is no change in temperature during the phase change. Unit: J kgā»1.

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Specific Latent Heat of Vaporization

The energy absorbed when one kilogram of liquid goes through a phase change to become gas. Notated as L. There is no change in temperature during the phase change. Unit: J kgā»1.

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Avogadroā€™s Constant

The number of particles in one mole of a substance, approximately equal to 6.022 x 10Ā²Ā³. Notated as N_A.

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Boltzmannā€™s Constant

A physical constant that relates the average kinetic energy of particles in a gas with the temperature of the gas, approximately equal to 1.38 x 10ā»Ā²Ā³ JKā»1. Notated as k_B.

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Gas Constant

A constant that appears in the ideal gas law, relating pressure, volume, temperature, and the number of moles of a gas, approximately equal to 8.31 JKā»1. Notated as R.