What does a tube permeameter measure?

What does a tube permeameter measure?

• A. Porosity
• B. Hydraulic conductivity
• C. Bulk density
• D. PH

Answer: (B)

This item is about hydraulic conductivity and how a permeameter quantifies how easily water moves through soil. A tube permeameter sets up water flow through a soil sample and measures how much water passes through in a given time under a known hydraulic gradient. By recording the flow rate (Q), the length of the soil column (L), the cross‑sectional area (A), and the hydraulic head difference (Δh), you can apply Darcy’s law to find the hydraulic conductivity (K). The common relationship is K = QL / (A Δh) for a constant-head test, or a similar form for a falling-head test. This device directly yields K, not porosity, bulk density, or pH. Porosity is about the fraction of void space and is measured differently; bulk density involves mass per total volume; pH is a chemical property of the water/soil. Understanding how K reflects the ease of water movement through the pore structure helps explain why the tube permeameter is the right tool for this measurement.

This item is about hydraulic conductivity and how a permeameter quantifies how easily water moves through soil. A tube permeameter sets up water flow through a soil sample and measures how much water passes through in a given time under a known hydraulic gradient. By recording the flow rate (Q), the length of the soil column (L), the cross‑sectional area (A), and the hydraulic head difference (Δh), you can apply Darcy’s law to find the hydraulic conductivity (K). The common relationship is K = QL / (A Δh) for a constant-head test, or a similar form for a falling-head test. This device directly yields K, not porosity, bulk density, or pH. Porosity is about the fraction of void space and is measured differently; bulk density involves mass per total volume; pH is a chemical property of the water/soil. Understanding how K reflects the ease of water movement through the pore structure helps explain why the tube permeameter is the right tool for this measurement.