Soil Water Content Calculations

Landon Newman explains how to calculate bulk density, porosity, gravimetric, and volumetric water content using a soil sample. The video covers the necessary formulas and assumptions, such as using a standard particle density when not provided. Each calculation is detailed with steps and considerations for significant figures.

What is the initial weight of the soil sample before drying?

• 175.5 grams

• 250.0 grams

• 200.0 grams

• 300.0 grams

How is the volume of the soil sample calculated?

• Height times radius squared

• Diameter times pi times radius

• Height times pi times radius squared

• Height times diameter

What is the formula for calculating bulk density?

• Volume divided by dry weight

• Dry weight divided by volume

• Wet weight divided by volume

• Wet weight divided by dry weight

What is the assumed particle density used in porosity calculations?

• 3.00 grams per centimeters cubed

• 2.65 grams per centimeters cubed

• 2.00 grams per centimeters cubed

• 1.00 grams per centimeters cubed

How is porosity calculated using bulk density and particle density?

• Particle density divided by bulk density

• Bulk density plus particle density

• 1 minus bulk density divided by particle density

• Bulk density divided by particle density

What is the definition of gravimetric water content?

• Volume of water per unit volume of soil

• Mass of water per unit mass of oven-dried soil

• Mass of soil per unit volume of water

• Volume of soil per unit mass of water

How is gravimetric water content calculated?

• Dry weight minus wet weight divided by dry weight

• Wet weight minus dry weight divided by dry weight

• Dry weight minus wet weight divided by wet weight

• Wet weight minus dry weight divided by wet weight

What is the assumed density of water used in volumetric water content calculations?

• 1.50 grams per centimeters cubed

• 0.50 grams per centimeters cubed

• 1.00 grams per centimeters cubed

• 2.00 grams per centimeters cubed

How is volumetric water content calculated?

• Bulk density times density of water divided by gravimetric water content

• Gravimetric water content times bulk density divided by density of water

• Gravimetric water content divided by bulk density times density of water

• Density of water divided by gravimetric water content times bulk density

What is the final weight of the soil sample after drying?

• 175.5 grams

• 150.0 grams

• 200.0 grams

• 250.0 grams