mass per unit of volume. The reason for testing density of doors because doors must contain a density of 14.34lbs per ft3 of foam‚ or it will collapse if the density is too high. If the density is too low‚ it won’t allow for normal expansion during weather changes. You may have a uncertainty of plus or minus 0.5lb per ft3 (“Open Door”) Uncertainty is the range of possible values that lie between the actual value. In order to find the density‚ you need two main measurements volume and mass. Mass is
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Measurement: Length‚ Mass‚ Volume‚ Density‚ and Time Peter Jeschofnig‚ Ph.D. Version 42-0267-00-01 Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab
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Surface area of an object was compared to its volume and weight in this experiment. It was discovered that as volume increased the surface area to volume ratio decreased as did the surface area to weight ratio. In this experiment cubes were studied as a model for cells which have a spherical shape. Cells get nutrients through the cell membrane which covers the surface area of the cell. Cells need to feed the entire volume of the cell. As the volume increases the surface area increases but not
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of mass and volume. The ratio of the mass per unit volume is density‚ d and is written as (D = m/v). Using the metric system‚ the ratio for solids and liquids is expressed in g/mL or g/cm. Matter expands and contracts according to temperature. For liquids and solids‚ the change in volume is very small‚ but for gases‚ a temperature results in a proportional change in the volume. Therefore‚ gas density is dependent upon temperature; for liquids and solids‚ the small effect on volume is often ignored
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Pennies 7 g 21.5 g 0.0215 kg 3 Quarters‚ 1 Dime‚ 5 Pennies 10 g 31.9 g 0.0319 kg Key 5 g 7.3 g 0.0073 kg Key‚ 1 Quarter‚ 4 Pennies 8 g 23.1 g 0.0231 kg Data Table 4: Liquid measurements. Mass A Mass B Mass B - A Liquid Volume (mL) Graduated Cylinder (g) Graduated Cylinder with liquid (g) Liquid (g) Density g/mL % Error Water 5 mL 17.1 g 22 g 4.9 g 0.98 -2 Isopropyl alcohol 5 mL 17.1 g 21.2 g 4.1 0.82 4.33 Data Table 5: Magnet – Measurement
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a width of 2.5 m. P = 2(L x W) P = 2(10 + 2.5) P = 20 + 5 P = 25 3. Find the area of the circle. A = πr3 A = π42 A = π16 A = 50.26 4. Find the volume of a sphere with a radius of 5 m. Remember that the volume of a sphere is. V= 4/3π 53 V= 4/3π125 V=523.598 5. What is the side length of a rectangular prism with a volume of 144 m3‚ a width of 2 m‚ and a height of 6 m? V= 144 m3 W= 2 m H= 6 m V=LxWxH 144= Lx2x6 144=12 144/12 = 12/12 12 m= L 6. Find the area of the triangle
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capabilities of using equipment to measure volume‚ mass‚ density‚ and specific gravity of solids and liquids with accuracy. Equipment: Students use the electronic balance to measure the mass of metals‚ pipettes‚ and pipettes holding liquids. The user presses the tare button to set the scale back to 0 g‚ and then places the metal or pipette onto the balance. The result is rounded to two decimal places. The graduated cylinder is used for measuring volume of a liquid or water displaced by a solid
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| Cold water from tap(Celsius) | Ice water (Celsius) | Ice water-5 min | 5 | 0 | -2 | Volume Measurement * The curved surface of the lid in a glass is cylinder is called the meniscus. * Fill a small test tube with water. * Pour the water from the test tube into the 25 mL graduated Cylinder. Record the volume of the water below. Empty the graduated cylinder. * Determine the volume of a thin –stemmed pipet: a) Completely fill a clean‚ empty pipet with water. b) Hold
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1. What is the relationship between rate of ion exchange and surface-to-volume ratio? - As the surface-to-volume (SA:V) decreases the rate of ion exchange will also decrease. 2. Why is it important for a cell to have a large surface-to-volume ratio? - If the SA:V is too small then then rate of ion exchange will decrease‚ if this rate of ion exchange is too low then the cell will no longer be viable. 3. Which is more efficient at exchanging materials‚ a small or a large cell? EXPLAIN
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first step to find density is finding the volume by using (length x width x height). This way is the most used way to find volume because most kids are familiar with it. The other way is water displacement. If you have a beaker of water then you look at eye level to see what the initial volume is and then drop the substance in the water and then that gives you the final volume. Once you have that then you subtract the final by the initial to get the volume. I myself like water displacement because
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