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Heat (energy)...

ks3

QuestionAnswer
Elements don't split into any-thing simpler through Chemical methods as they only contain 1 of 1 kind of atom.
Heat is a type of energy, specifically kinetic energy possessed by particles.
Heat ENERGY is measured in joules (J). The amount of joules in a kilojoule(KJ) is 1000.
If something gains a lot of heat energy, it (can) become hot.
The measure of how hot or cold an object is, known as temperature.
Usually temperature is measured in degrees Celsius (ºC).
At 1 atm the freezing point of water is defined as 0ºC and the boiling point of water is defined at 100ºC. Atm is an abbreviation of atmosphere and is a unit of pressure based on the average atmospheric pressure at sea level.
In terms of newtons per centimeter squared, 1 atm (atmosphere) is equal to 10.1325 newtons per centimeter².
Temperature can be measured by a variety of different thermometers. These include liquid in glass, d.... igital, therm.... ocouple and bimetal strip thermometers.
The correct phrase for heat transfer is ‘thermal transfer’.
Heat energy can be transferred by four processes, which in alphabetical order are: conduction, convection, evaporation and radiation. In each process, thermal energy is also transferred in the way: hot to cold.
Heat energy only flows when there is a temperature difference.
Substances may be made up of particles, one of the 3 from atoms, ions or molecules.To each other, these particles are attracted. They move around meaning that they have kinetic energy. The kinetic energy of particles increases with temperature.
Metals are good conductors of heat because: inside metals there are both atoms and electrons.The free electrons can move around and vibrate. The heat energy is passed on by neighbouring particles vibrating along the metal.
In metals through vibrations, neighbouring particles pass on so called; 'heat energy'.
Non-metals are poor conductors of heat. In a non-metal, heat energy is only passed on by neighbouring particles vibrating along the non-metal as there are no free electrons.
Non-metals are poor conductors of heat. In a non-metal, heat energy is only passed on by neighbouring particles vibrating along the non-metal as there are no free electrons.
Poor conductors of heat are known as insulators.
Liquids and gases are poor conductors of heat and therefore good insulators.
Apart from non-metals,liquids, solids and gas an insulator of heat is a vacuum.
When substances are mixed; they settle in order of density with the least dense at the top.
Density depends on how far apart particles are.
With convection currents, heat rises to the top then seperates(sometimes.) in directions that are opposite as it begins to cool. As it gets to the bottom, the current then begins to heat up before returning to its starting point and afterwards the cycle is repeated.
Convection currents do not occur in solids because the particles are held in fixed positions.
Two states in which convection currents can occur are liquids and gas.
Heat can move by travelling as infrared waves. Like light waves, these are electromagnetic waves, but with a longer wavelength. As infrared waves act like light waves, they can travel through a vacuum but not objects that are opaque. They can also be reflected and travel at approximately 300,000,000m/s.
Black absorbs more heat than white as it is a lack of colour and absorbs all frequencies of 'visible light' and all colours in the 'spectrum'. That energy stores up alongside heat, effectively radiating it.
White (supposedly) absorbs all frequencies and light but does not radiate heat.
At a cold enough temperature, even substances that are normally gases may become solid. Super heated gas is plasma.
As long as they don’t catch fire or decompose first, at higher temperatures, solids change to become either liquids or gases.
If a solid is heated, its temperature rises until the solid reaches its melting point. At the melting point, the temperature stops rising whilst the solid melts. This is because heat energy is going into separating the particles rather than raising the temperature. Once all the solid has melted, the temperature once again starts to rise until it reaches the boiling point. As energy goes into further separating the particles, at the boiling point the rising of the temperature stops.
Evaporation occurs when the particles in a liquid escape to form a vapour. The particles that escape take some energy from the remaining particles and so the temperature of the liquid falls.
Evaporation can occur at any temperature but it occurs most rapidly at a liquid’s boiling point. Evaporation is also another method of thermal transfer.
Radiation is the transfer of thermal energy by electromagnetic waves, which does not need a medium.
A material that does not allow heat energy to flow through it is known as an insulator.
The transfer of heat energy is known as heating.
Convection is the way that heat energy travels through both liquids and gases because their particles are free to move, and take the place of particles with less
The way that heat energy travels through solids because their particles are close together is known as conduction. When a substance is heated, its particles gain energy and [] more vigorously vibrate more vigorously. The particles bump into nearby particles and make them [] more vibrate more. This passes the thermal energy through the substance by
A material that allows heat energy to flow through it is known as a conductor.
At the melting point of a substance, the point of attraction gets weaker.
Usually when objects are heated; they expand and when they are cooled (with the exception of water) substances usually contract.
Substances that allow thermal energy to move through them easily are called conductors.
Substances that do not allow thermal energy to move through them easily are called insulators.
'All' objects transfer thermal energy by [] [] infrared radiation. The infrared radiation. The hotter an object is, the more [] [] it gives off infrared radiation it gives off. No p[] are involved in radiation, unlike conduction and convection particles. (Infrared cameras give images even in the dark, because they are detecting heat, not visible light.)
Non-metals are poor conductors of heat. In a non-metal, heat energy is only passed on by neighbouring particles vibrating along the non-metal as there are no free electrons. This allows a flow of energy from hot to cold.
Created by: Toluo