Thermal Mechanics and Temperature Concepts

Flashcards covering key concepts related to thermal mechanics, temperature, and associated vocabulary based on the lecture.

Thermal Mechanics

The branch of physics that deals with the relationships between heat and other forms of energy, and the behavior of matter in the presence of thermal energy.

Temperature

A measure of the average kinetic energy per particle in a substance, indicating how hot or cold that substance is.

Thermal Energy

The total energy of all the particles in a substance due to their motion; it is proportional to temperature and depends on the number of particles present.

Phase Change

A transition of a substance from one state of matter to another (solid, liquid, gas); for example, melting or boiling.

Kinetic Energy

The energy that an object possesses due to its motion; in the context of temperature, it refers to the energy of moving particles.

Calorie

A unit of thermal energy; commonly used to quantify the amount of energy in food.

Fahrenheit

A temperature scale used primarily in the United States, where water freezes at 32 degrees and boils at 212 degrees.

Celsius

A temperature scale used in most of the world, where water freezes at 0 degrees and boils at 100 degrees.

Evaporation

The process by which a liquid turns into a gas; it occurs at any temperature, occurring particularly at the surface of the liquid.

Condensation

The process by which a gas turns into a liquid, often occurring when the gas is cooled.

Buoyancy

The ability of an object to float in a fluid due to the upward force exerted by the fluid.

Absolute Zero

The theoretical lowest temperature possible, at which a system's entropy reaches its minimum value; equivalent to 0 Kelvin, about -273.15°C.

Thermometer

An instrument used to measure temperature by observing the expansion of a liquid, typically mercury or colored alcohol, in a glass tube.

Molecular Vibration

The oscillation of atoms in a molecule, which contributes to the overall thermal energy and temperature of a substance.

Plasma

A state of matter where gases become ionized, containing free electrons and ions, typically at very high temperatures.