DILATAÇÃO TÉRMICA LINEAR | Resumo de Física para o Enem

📚 Free e-book with the most common topics in Math and Natural Sciences on the ENEM (National High School Exam): http://bit.ly/35OYaeg Material expansion occurs when there is an increase in the body's dimensions, 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 a different letter. Linear expansion is generally calculated for wires or any material where expansion is desired in only one direction or dimension. The mathematical expression for calculating linear expansion (Δl) is: Δl = lo . α . Δt Where: lo = initial length of the analyzed body α = coefficient of expansion of the material constituting the body Δt = Temperature variation, final temperature minus initial temperature (tf – to) Important notes: Expansion occurs proportionally to length and temperature; If you use centimeters for the length of the wire, the result of the expansion will also be in centimeters, so be careful not to make a mistake in the exercise answer; When the final temperature is lower than the initial temperature, that is, cooling has occurred, the mathematical result of the expansion will be negative, which means that contraction has occurred, that is, its size has decreased. Learn about our free course: https://goo.gl/2rebsa Written lesson on this content: https://cursoenemgratuito.com.br/dila... Simulated exam on this content: https://cursoenemgratuito.com.br/simu... #Enem #Physics #Dilation #Linear #Thermology DID YOU LIKE THE VIDEO? // Subscribe to the channel // Give a thumbs up // Leave your comment // Share with friends SOCIAL MEDIA // FACEBOOK /cursoenemgratuito/ // INSTAGRAM @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.