Gravity lab7/25/2023 ![]() ![]() But the number of moons depends on many things besides the mass of the planet.) (Note: one of the the Analysis questions on page 2 tries to get at the idea of large mass with a question about why bigger planets have more moons. that gravity will exist between ANY two objects. It may also be helpful to point out that there’s “nothing special” about the spheres - i.e. Asking or helping students to convert to scientific notation, or counting place values after the decimal, may be ways to do this. A teacher will need to point out, or have students determine, what those numbers are “really saying”. Average specific gravity at 20☌ should be reported to the nearest 0.01.This resource appears to be designed to build towards this disciplinary core idea, though the resource developer has not explicitly stated so.Ĭomments about Including the Disciplinary Core Ideaīecause the lesson as written focuses on qualitative data and relationships, students might miss the fact that the forces between the two spheres are incredibly tiny, and just focus on whether the numbers are changing to get bigger or smaller.Summary and conclusions – Comment on the specific gravity of the given soil sample.Analysis of test results – Complete the table provided and show one sample calculation.Your report should include the following: Use the template provided to prepare your lab report for this experiment. Temperature Correction Factor, A (from Table)=0.9993 Mass of flask + soil + water filled to mark, W 2(g)= 745.1 gm Mass of flask + water filled to mark, W 1(g)=683 gm Results and Discussions Sample Data Sheet Determine the mass of the dry soil in the evaporating dish (W s).Ī PowerPoint presentation is created to understand the background and method of this experiment.Ī short video is executed to demonstrate the experiment procedure and sample calculation.Put the evaporating dish into an oven to dry it to a constant weight.Use a plastic squeeze bottle to wash the inside of the flask, making sure that no soil is left inside. Pour the soil and water into an evaporating dish.Determine the combined mass of the bottle plus soil plus water (W 2).įigure 2.6: Taking the final weight of pycnometer filled with water and soil sample (after theapplication of vacuum).Dry the outside of the flask and the inside of the neck above the meniscus. Add de-aired, distilled water to the volumetric flask until the bottom of the meniscus touches the 500 ml mark.Notice that this is an extremely important step, as most errors in the results of the test are due to entrapped air that has not been removed. Remove the air from the soil-water mixture by applying a vacuum pump or an aspirator until all of the entrapped air has been removed.Add distilled water to the volumetric flask containing the soil or soil paste until it is about two-thirds full.įigure 2.6: Filling the rest of the pycnometer with water.Transfer the soil (if granular) or the soil paste (if cohesive) into the volumetric flask.įigure 2.5: Placing the sample in a pycnometer.(This step is not necessary for granular, i.e., non-cohesive soils.) Soak it for one-half to one hour in the evaporating dish. For cohesive soil, add de-aired and distilled water to the soil and mix it until it forms a smooth paste.Put approximately 100 grams of air-dried soil into an evaporating dish.Insert the thermometer into the flask with the water to determine the water’s temperature (T= T 1☌.)įigure 2.3: Temperature of the water during the test.Measure the mass of the flask and the water W 1.įigure 2.2: Measuring the weight of pycnometer filled with water.Carefully fill the flask with de-aired, distilled water up to the 500 ml mark (The bottom of the meniscus should be at the 500 ml mark).įigure 2.1: Fill the flask with distilled water.Vacuum system, vacuum pump, or water aspirator.Hot plate or Bunsen burner that is capable of maintaining a temperature high enough to boil water.Thermometer graduated with a division of 0.1☌.Volumetric flask (500 ml) with a stopper that has a pipe hole.To determine the specific gravity of soil solid at 20☌ using a pycnometer.The specific gravity of soil solids is used to calculate the density of the soil solids.The specific gravity of soil solid is used in calculating the phase relationships of soils, such as the void ratio and the degree of saturation.The specific gravity of soil is usually reported at 20☌. ![]() ![]() The specific gravity (G s)of a material is the ratio of the mass of a unit volume of soil solids at a specific temperature to the mass of an equal volume of gas-free distilled water at the same temperature. ![]()
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