Energy and Insolation Lecture

Comprehensive vocabulary review flashcards covering electromagnetic energy, insolation, environmental interactions, heat transfer, and thermal properties of water.

Insolation

Incoming solar radiation; electromagnetic energy from the sun that reaches the Earth. Its intensity depends on angle, duration, and type of surface.

Angle of Insolation

A measure of how high the sun is in the sky, measured from the horizon up to the position of the sun. It is greatest at solar noon and varies by season and latitude due to Earth's spherical shape.

Duration of Insolation

The length of time from sunrise to sunset, or the daylight period, that the sun appears in the sky.

Relationship of Insolation to Temperature

As the angle of insolation and duration of insolation increase, the temperature at Earth's surface increases.

Reflection

An interaction where light bounces off a surface. It increases when the angle of insolation is lower, or when the surface is light in color, smooth, or covered by snow or ice.

Refraction

The bending of sunlight as it passes through a medium, such as air layers of differing optical densities or water, which causes a shift in the perceived position of the sun at sunrise and sunset.

Scattering

The process where sunlight strikes particles and air molecules in the atmosphere and disperses in all directions.

Absorption of Insolation

The taking in of solar energy by surfaces, favored by dark-colored and rough materials. Absorbed energy is subsequently reradiated back into the atmosphere at night as infrared heat waves.

Heat

The transfer of thermal energy from a hotter object to a colder one due to a temperature difference, measured in joules.

Temperature

A measurement of the average kinetic energy of molecules within a substance, measured in degrees Celsius, Fahrenheit, or Kelvin.

Specific Heat

The amount of energy required to raise the temperature of $1\,\text{gram}$ of a material by $1^\circ\text{C}$. Liquid water has a specific heat value of $4.18\,\text{Joules/gram}\cdot^\circ\text{C}$.

Conduction

The transfer of heat through direct contact between materials.

Convection

The transfer of heat within fluids driven by density differences.

Radiation

The flow of energy in the form of electromagnetic energy, representing the fastest form of energy transfer.

Heat Energy Gained During Melting of Water

The amount of latent heat absorbed by water to undergo melting, equal to $334\,\text{J/g}$.

Heat Energy Released During Freezing of Water

The amount of latent heat given off by water during freezing, equal to $334\,\text{J/g}$.

Heat Energy Gained During Vaporization of Water

The amount of latent heat absorbed by water during vaporization, equal to $2260\,\text{J/g}$.

Heat Energy Released During Condensation of Water

The amount of latent heat given off by water during condensation, equal to $2260\,\text{J/g}$.

Density of Water at $3.98^\circ\text{C}$

The maximum density of liquid water, which is equal to $1.0\,\text{g/mL}$.

Sublimation

The phase transition in which a solid changes directly into a gas without passing through the liquid phase.

Deposition

The phase transition in which a gas changes directly into a solid without passing through the liquid phase.

Visible Spectrum

The portion of the electromagnetic spectrum visible to the human eye, with violet light having a wavelength of $4.0 \times 10^2\,\text{nm}$ and red light having a wavelength of $7.0 \times 10^2\,\text{nm}$.