Put it on a weighing machine!
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To calculate the weight of a brass square bar, you would first determine its volume by multiplying the length, width, and height of the bar. Then, multiply the volume by the density of brass (around 0.310 lb/in³ or 8.55 g/cm³) to obtain the weight in the desired units.
It really depends on what type of brass bar one is talking about. Brass bars can be used to be made into many things including shower handle bars, coat racks, and other decorative pieces.
Look on the wrapper. Find the number of grams in the whole bar. Write down the number, and call it 'G'. Now tear the wrapper open and expose the whole bar. Count the number of squares in it. Write down the number and call it 'S'. Divide 'G' by 'S'. In other words, calculate the number that's equal to (G/S). That quotient is the average number of grams per square in that bar.
24 bar is approximately equal to 348.11 pounds per square inch (psi).
4.5 bar is equivalent to approximately 65.26 pounds per square inch.
As of 23 February 2016, copper is worth $2.11/pound. The value of the bar depends on the weight.