If the viscosity of a liquid is doubled, what happens to the flow rate through a

Practice Questions

Q1
If the viscosity of a liquid is doubled, what happens to the flow rate through a pipe, assuming all other factors remain constant?
  1. Flow rate doubles
  2. Flow rate halves
  3. Flow rate remains the same
  4. Flow rate quadruples

Questions & Step-by-Step Solutions

If the viscosity of a liquid is doubled, what happens to the flow rate through a pipe, assuming all other factors remain constant?
Correct Answer: Flow rate will be halved.
  • Step 1: Understand what viscosity is. Viscosity is a measure of how thick or sticky a liquid is.
  • Step 2: Know that flow rate is how fast the liquid moves through a pipe.
  • Step 3: Remember Poiseuille's law, which relates viscosity, flow rate, and other factors in a pipe.
  • Step 4: According to Poiseuille's law, if the viscosity of the liquid is doubled, the flow rate will decrease.
  • Step 5: Specifically, if viscosity is doubled, the flow rate will be halved, meaning it will flow slower.
  • Viscosity and Flow Rate – The relationship between viscosity and flow rate in a fluid, particularly as described by Poiseuille's law.
  • Poiseuille's Law – A principle that relates the flow rate of a fluid through a pipe to its viscosity, pipe length, pipe radius, and pressure difference.
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