# Thermo-Insulated Living Physics

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Introduction
Thermodynamics is an essential concept examined during the construction stage of houses, especially in the countries reaching extreme temperatures, such as Australia. By understanding the physics involved in thermodynamics throughout the construction stage of houses, such as heat transfer involving different colours and thicknesses, it is possible to re-examine the insulation of houses in hot countries. Such a report can lead to finding the most appropriate colour and thickness for the best thermo-insulated houses in Australia.
Relevant Physics Principles
Heat Transfer
When temperature difference exists in a body, the heat flows from the regions of high temperature to the regions of low temperature. It is this temperature difference
In convection, warm particles move to a region with substance at a lower temperature and particles transfer heat by colliding with the cooler particles (Sukhatme, 2005). As it collides the warm particles lose heat to become cooler whereas cool particles gain heat to become warmer. This cycle repeats, occurring in circular motion (The Physics Classroom, 2015).
An example of this is shown by the heat transfer through water in a heated pot on a stove. As the metal pot becomes hotter, it begins to conduct heat to the water. The water at the boundary with the metal pan becomes hot and the fluids expand and becomes less dense. The differences in water density between the bottom of the pot and the top of the pot results in hot water rising to the top, displacing the colder water and the cold water moving to the bottom of the pot. However, this cold water is then heated and begins to rise. This causes circulation currents, which provides the pathway for heated water to transfer energy from the bottom of the pot to the surface (The Physics Classroom, 2015).
Diagram 2 – Process of Convection in water when heating up a
Violet is at the short-wavelength end of the visible spectrum, 400nm, so it reflects the short wavelengths and absorbs longer wavelengths. However, red light is at the long-wavelength end of the visible spectrum, 700nm, so it reflects long wavelengths and absorbs shorter wavelengths. The shorter the wavelengths, the higher the light energy is so the temperature of the colours near the ‘violet’ end of the visible spectrum increases more drastically than the colours near ‘red’ end. Therefore, the lighter the colour, the lower the absorption and the higher the reflection, while the darker the colour, the higher the absorption and the lower the reflection (Olson,

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