Convection

Convection is the transfer of thermal energy from one place to another by means of bulk fluid movement in the material medium. In fluids, thermal energy transfer is mainly through thermal convection. In solids, since its substance cannot flow, there can be no thermal convection. Mechanism: In convection, the movement occurs as a result of gravity. The hot part of …

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Ripple Tank

  The ripple tank is used to generate water waves in laboratory. It is useful in demonstrating wave properties such as reflection and refraction. It consists of a shallow tray of water with a transparent base, a light source directly above the tray and a white screen beneath the tray to capture the image of the shadows formed when water …

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Bladeless Fan

On 18 October 2009, James Dyson announced the release of a new product called the Dyson Air Multiplier. Designed to replace the desktop or window fan, the Air Multiplier is intended to provide smoother airflow and operate in a safer manner than similar products. Detailed explanation: How Stuffs Works Pros: No risk of injury due to the blades (baby safe?) …

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Conduction (O Level)

Conduction is the transfer of thermal energy from one place to another without any flow of the material medium. Metals are good thermal conductors. Non-metals (plastics) are poor thermal conductors.(they are thermal insulators) Conduction typically requires the objects to be in physical contact with one another. Mechanisms of conduction: 1. Atomic Collisions In solids, atoms or molecules vibrate about their …

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Thermal Equilibrium

Two objects, in thermal contact, are said to be in thermal equilibrium with each other if there is no net heat flow between them. In thermal contact, the hotter body becomes cooler while the cooler body becomes hotter until a point is reached where no more change occurs. The two objects are said to be at the same temperature if …

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Temperature

Thermal energy is a form of internal energy. Thermal energy is possessed by all material matter and manifest as the random motion of atoms and small particles. The amount of thermal energy depends on the temperature of the matter. A simplified definition for temperature: Temperature is a measure of the degree of hotness or coldness of a body. Thermal energy …

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Pressure In Gases

A gas, made up of many particles called molecules that are in continuous random motion, colliding with one another and with the walls of the container. As the gas molecules strike and bounce off the walls, they exert a force on the walls. All these small forces add up so that a large number of collisions produces a total average …

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