DILATAÇÃO TÉRMICA SUPERFICIAL E VOLUMÉTRICA | Resumo de Física para o Enem. Professora Lia

📚 Natural Sciences E-book: http://bit.ly/35OYaeg Material expansion occurs when the body's dimensions increase, generally associated with an increase in its temperature. Contraction, on the other hand, is the opposite: its dimensions decrease due to a decrease in temperature. Thermal expansion in solids depends on three factors: Changes in the body's temperature; Its dimensions (length, width, and height); and The material constituting the body. It is important to emphasize the last factor, the material constituting the body. Each material expands differently. One way to distinguish this is to consider the coefficient of expansion specific to each material. This coefficient is indicated by a Greek letter, and depending on the dimensions of the body, it receives another letter. For two-dimensional expansion, surface expansion, it is indicated by the Greek letter beta (β). For three-dimensional expansion, volumetric expansion, it is indicated by the letter gamma (γ). The coefficient of expansion beta is twice the coefficient of linear expansion a, and the coefficient of volumetric expansion is three times the linear coefficient. Mathematically, we have: β = 2 α and γ = 3 α Surface thermal expansion is usually calculated on sheets or surfaces and observed in two dimensions. The expression for the calculation is similar: ΔA = Ao β β Δt In volumetric thermal expansion, we observe all three dimensions that constitute the body. Likewise, the expression for its calculation is similar to the previous ones: ΔV = Vo γ . Δt Learn about our free course: https://goo.gl/2rebsa Written lesson on this content: https://cursoenemgratuito.com.br/dila... Simulated test on this content: https://cursoenemgratuito.com.br/simu... #Physics #Thermology #Dilation DID YOU LIKE THE VIDEO? // Subscribe to the channel // Give a thumbs up // Leave your comment // Share with friends SOCIAL MEDIA // FACEBOOK /cursoenemgratuito/ // INSTA @cursoenemgratuito // TWITTER @enemgratuito Curso Enem Gratuito is an independent channel that disseminates learning support content and information about programs and opportunities for accessing higher education.