Which change to the experimental design would improve the reliability of the engineers’ measurements?

1. Collect one 200-milliliter (mL) sample of soil from each of three locations.

2. Place each soil sample in a beaker.

3. Add 200 mL of water to each sample and allow the water to saturate the soil.

4. Measure the amount of standing water in each beaker (amount of water the soil did not absorb).

5. Determine the amount of water in the soil sample by subtracting the amount of standing water from 200 mL.

6. Divide the amount of water in the soil sample by 200 mL and multiply by 100 to determine the percent porosity of the soil.

Which change to the experimental design would improve the reliability of the engineers’ measurements?

A.using a liquid other than water to determine porosity

B.using flasks instead of beakers

C.testing single samples from more than three locations

D.testing more samples from each location

2 Answers

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  • 7 months ago

    1. use Helium pycnometer, tap density analyzer, mercury porosimetry, liquid nitrogen sorption and water vapor sorption tests based on gravimetric rig to characterize the soil regarding-bulk density, skeletal density, pore size and pore size distribution, pore shape, pore volume, BET surface area, moisture saturation capacity and the external and internal porosity values.

    2. analyze more samples at various depths and various locations

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  • 7 months ago

    A. Water is not necessarily the best liquid for a porosity determination. Porosity is defined as a measurement of empty spaces between particles. In the case of soil, the soil particles themselves will absorb water. So this test will overstate the amount of porosity.

    Getting more soil samples is always a good idea because soil can vary within short distances. But if your method is flawed, getting more incorrect data does not help.

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