4. Indirect measurements 4.2. Measuring density Measure density 38 What do we get when we press the tare button on the scales? Explain how this button can be useful when you have to measure a certain amount of sugar, flour or butter. 39 Calculate the density of steel using the data obtained from measuring the mass and volume of the nut and bolt. 40 Why is it important for the liquid to be at eye level when measuring its volume in a graduated cylinder? What happens if we are in a higher position? What about in a lower position? Conclusions Note: you must use the same scales and leave them switched on during the whole process. To calculate the density, first we need to measure the mass and volume of the solid. To calculate the density, first we need to measure the mass and volume of the liquid. A. Measure the density of a liquid B. Calculate the density of a solid that does not dissolve in water 1. Turn on the scales, place the empty graduated cylinder on them and tare them (set them to zero). 3. Place the graduated cylinder containing the liquid on the scales and measure its mass. m = 117 g 2. Take a graduated cylinder that will hold the solid. Pour in water up to a certain level and measure the volume. V1 = 30 mL 3. Put the solid into the water and measure the new water level. V2 = 40 mL 2. Pour a certain amount of liquid into the graduated cylinder and measure the volume. V = 40 mL 1. Turn on the scales and wait until they read zero. Measure the mass of the solid. m = 72 g Vsolid = V2 - V1 24
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