SCEN101 Lecture Notes - Lecture 17: Thermal Expansion, Bimetallic Strip
27 Mar 2019
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70g of hot water at 80 c mixed with 40c at 80g, temp must be less than 60. Subscripts in science are used to show the same physical quantity applied in different scenarios. M(hot water) *(final temp-temp hot) +m (cold water) *(final temp-temp of cold)=0. |(final temp-temp hot| > |(final temp-temp of cold)| During change of state, you get a plateau in temperature. Extreme heat in summer may cause buckling on railroads. When iron strip is heated, brass expands more than iron. When heat flows to or from a system, the system gains or loses an amount of heat equal to the amount of heat transferred. Heat never spontaneously flows from a cold substance to a hot substance. Ex- in summer heat flows from the hot air outside into the cooler interior of a dwelling. Natural systems tend to disperse from concentrated and organized energy states toward diffuse and disorganized states. Energy tends to degrade and disperse with time.
