Temperature Main Concept:

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Presentation transcript:

Temperature Main Concept: Temperature is a measure of the average kinetic energy of atoms and molecules.

Temperature Kelvin Temperature Maxwell-Boltzmann Distribution and Temperature

- All molecules in any sample are in motion - Kelvin temperature of a sample of matter is proportional to average kinetic energy of particles in sample - When average kinetic energy of the particles in a sample doubles, Kelvin temperature doubles. As temperature approaches 0 K (zero Kelvin), average kinetic energy of a system approaches a minimum near zero

- The Maxwell-Boltzmann distribution shows that distribution of kinetic energies becomes greater (more disperse) as temperature increases

Remember! average kinetic energy ≠ speed

Heat, Energy Transfer, and Conservation of Energy Thermal Energy of Particles (Hot vs. Cold) Transfer of Thermal Energy Work Thermal Energy and Work Conservation of Energy Defined

Heat Transfer Main Concept: The process of kinetic energy transfer at the particulate scale is referred to in this course as heat transfer, and the spontaneous direction of the transfer is always from a hot to a cold body.

- On average, molecules in the warmer body have more kinetic energy than the molecules in the cooler body. - Collisions of molecules in thermal contact transfer energy.

- Scientists describe this process as “energy is transferred as heat.” - Eventually, thermal equilibrium is reached as the molecular collisions continue. The average kinetic energy of both substances is the same at thermal equilibrium.

- Heat is not a substance - i.e. it makes no sense to say an object contains a certain amount of heat. Rather, “heat exchange” or “transfer of energy as heat” refers to the process in which energy is transferred from a hot body to a cold body in thermal contact. - transfer of a given amount of thermal energy will not produce the same temperature change in equal masses of matter with differing specific heat capacities

Energy Transfer Main Concept: Energy is transferred between systems either through heat transfer or through one system doing work on the other system.

- Heating a cold body with a hot body is a form of energy transfer between two systems - energy transfer also occurs in form of work (force over a distance) - Work can also be understood in Newtonian Mechanics or electromagnetism

- calculations involving work are limited to associated change in volume of a gas - Example: transfer of energy between systems through expansion of gas in a steam engine or car piston - based on molecular collisions with the piston: gas is doing work on piston, and energy is transferred from gas to the piston.

Conservation of Energy Main Concept: When two systems are in contact with each other and are otherwise isolated, the energy that comes out of one system is equal to the energy that goes into the other system. The combined energy of the two systems remains fixed. Energy transfer can occur through either heat exchange or work.

- When energy is transferred from system 1 to system 2, energy transferred from system 1 = energy transferred to system 2 - If a system transfers energy to another system, its energy must decrease; if energy is transferred into a system, its energy must increase

All of this can be summarized in the equation: q = -q Assumes: -no heat lost or gained outside of system -thermal equilibrium achieved (Energy gained by one system) (Energy lost by another system)