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Heat<span> can also be </span>transferred<span> by the </span>movement of fluids, <span>liquids and gases. Convection is </span>heat transfer<span> by the </span>movement<span> of </span>currents<span> within a </span>fluid<span>. During convection, </span>heated<span> particles of </span>fluid<span> begin to flow. When a </span>liquid<span> or gas is </span>heated<span>, the particles </span>move<span> faster and spread apart.
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Although sleep requirements vary from person to person , most teens are recommended to get 8 hours of sleep per night.
