The heat of vaporization (also known as enthalpy of vaporization) is the amount of energy required to convert a unit mass of a substance from liquid to vapor at constant temperature and pressure. The formula for calculating the heat of vaporization (ΔHvap​) is: Where: ΔHvap​ is the heat of vaporization (in joules per kilogram or […]
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The heat of fusion, also known as the latent heat of fusion, is the amount of heat required to change a unit mass of a substance from solid to liquid state at its melting point. The formula to calculate the heat of fusion (Qf​) is: Where: Qf​ is the heat of fusion (in joules, J),
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Heat transfer by convection refers to the transfer of heat between a solid surface and a fluid (liquid or gas) in motion. The rate of heat transfer by convection can be calculated using Newton’s Law of Cooling/Heating, which states: Where: Q is the heat transfer rate (in watts, W) h is the convective heat transfer
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The critical thickness formula typically refers to the critical thickness of a thin film for a given material system. This critical thickness is the maximum thickness below which the film remains coherent and above which it becomes strained or even fragmented due to lattice mismatch or other factors. The critical thickness (tc​) can be calculated
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The thermal resistance R of a material or a structure is typically defined as the ratio of the temperature difference (ΔT) across the material or structure to the heat transfer rate (Q) through it. Mathematically, it can be expressed as: Where: R is the thermal resistance (in units of K/W), ΔT is the temperature difference
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Collision frequency, in physics, often refers to the rate at which particles collide within a system, such as in gases or plasmas. The collision frequency depends on various factors such as the density of particles, their velocities, and the cross-sectional area of interaction. The collision frequency, denoted by Z, can be calculated for a gas
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The discharge coefficient (Cv) is a dimensionless parameter used in fluid dynamics to quantify the efficiency of a flow control device, such as a valve, nozzle, or orifice, in allowing fluid to pass through it. It represents the ratio of the actual flow rate through the device to the theoretical flow rate based solely on
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Atmospheric air pressure, often simply referred to as air pressure, is the force exerted per unit area by the weight of the atmosphere above a given point on the Earth’s surface or within the atmosphere itself. It is caused by the gravitational attraction of the Earth on the air molecules composing the atmosphere. As altitude
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Humidity of air refers to the amount of water vapor present in the atmosphere. It’s a key component of weather and climate, influencing factors such as temperature, precipitation, and the formation of clouds. Humidity is a crucial factor in human comfort, as it affects how hot or cold we perceive the temperature to be. Absolute
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The coefficient of performance (COP) is a measure of the efficiency of a device that uses work or energy to perform a particular task, such as heating, cooling, or refrigeration. It represents the ratio of the desired output or effect of the device to the required input or work put into the device. COP is
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