linear coefficients

Material α / °C Iron 12x10 -6 Copper 17x10 -6 Steel 11x10 -6 Gold 14x10 -6 Pyrex glass 3x10 -6 soft glass 9x10 -6 ' a ' of iron is 12x10 - 6 / 0 C means, if a rod of length 1m is heated through 1 0 C, then length increases by an amount of 12x1..

Linear Expansion - Let the length of the rod increase to 'l 2 ' . Increase in length = (l 2 -l 1 ) = l Rise in temperature = (t 2 -t 1 ) 0 c = t. The ratio of increase in length to its original length per every degree rise in temperature is known as ' the coefficient of lin..

The constant a , which describes the thermal expansion properties of a particular material, is the coefficient of linear expansion. The units of a are K - 1 or (C O ) - 1 (remember that a temperature interval is same in both the Kelvin and Celsius scales). For many materials, ..

>Now consider the system of linear equations with three variable Let the determinant of the coefficients be denoted by D i.e., Multiplying both sides by x, we have Adding y times column 2 and z times column 3 to column (1), we have Similarity it can be shown that, a..

Summary Simultaneous Equations - Finding the solution by the method of substitution. Finding the solution by the method of substitution. (i) Coefficients of one of the variables (say x) in the two equations are made equal, by multiplying them with suitable factors. (ii) By addition or sub..

Temperature Dependence of Resistivity - The resistivity of a metallic conductor nearly always increases with increasing temperature. As temperature increases, the ions of the conductor vibrate with greater amplitude, making it more likely that a moving electron will collide with an ion. This impede..

Rates of most chemical reactions increases with temperature because the rate constant 'k' increases with temperature. The temperature dependence of the rate constant is given by the Arrhenius equation, where..

. This gives In the temperature range in which resistivity increases linearly with temperature, the temperature coefficient of resistivity a is defined as the fractional increase in resistivity per unit increase in temperature. Ohm's law is obeyed by many substances, but it is n..

The determinant of coefficients ..

. The thermo emf increases with temperature and reaches a maximum value at a certain temperature, called the neutral temperature T n . The value of the neutral temperature is constant for a thermocouple, depends on the nature of materials and is independent of the temperature of the cold junction. ..