W AutoSave Off T4a Thermal Expansion 08.06.20 (1) . Saved to this PC . Search (Alt+Q) shemar tulloch ST X File Home Insert Draw Design Layout References Mailings Review View Help Comments Share Times New Roman ~ 14 ~ A" A Aa Ap EVENEVENT Find Normal No Spacing Paste Heading 1 Heading 2 Title Replace BIUvab x x A LABEL BY Dictate Editor Select Undo Clipboard Font Paragraph Styles Editing Voice Editor Theoretical Background: Most materials expand when heated and contract when cooled. The increase in any one dimension of a solid is called linear expansion. If a rod of length Lo and initial temperature To undergoes a temperature change of a reasonably small magnitude of AT, the change in length, AL, is generally proportional to Lo and AT. Stated mathematically: AL = aLoAT (1) Here a is called the coefficient of linear expansion for the material with common units of 1/C = (C)-1. Then, solving equation 1, the coefficient of linear expansion will be given by: AL a = = LOAT (2) Different materials with the same initial length expand and contract by different amounts as the temperature changes, so the value a depends on the nature of the material. For materials that are not isotropic, such as an asymmetric crystal for example, a can have a different value depending on the axis along which the expansion is measured. The coefficient a can also vary somewhat with temperature so that the degree of expansion depends not only on the magnitude of the temperature change, but on the absolute temperature as well. In this experiment, you will measure a for aluminum, brass, and copper. These metals are isotropic, that means a needs only be measured along one direction. Also, within the limits of this experiment, a does not vary with temperature. The materials and corresponding values of the coefficient of linear expansion, reported by the manufacturer, for the metal tubes used on this experiment can be found in Table 1. Table 1. Accepted values for the coefficient of thermal expansion, a. Material a (C-1) Composition (%) Aluminum (6061-T6) 2.36 *10-5 Al (95.8 - 98.6), Mg (0.80 - 1.2), Fe (Thermal expansion apparatus. Steam Generator >Steam generator > Temperature sensor > Meter stick Glass cup > Computer with Thermal Expansion Apparatus Pasco Capstone Temperature Sensor Software > Heat resistant gloves Meter Stick Page 1 of 6 1312 words Text Predictions: On " Focus + 100%