ASVAB Practice Test

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What happens to the pressure in a fluid when it flows through a narrower section of a pipe?

  1. The pressure increases

  2. The pressure stays the same

  3. The pressure decreases

  4. The pressure fluctuates

The correct answer is: The pressure increases

When fluid flows through a narrower section of a pipe, the following occurs Due to the decrease in cross-sectional area, the velocity of the fluid increases according to the principle of continuity. As a result, the kinetic energy of the fluid also increases. According to Bernoulli's equation, as the kinetic energy increases, the pressure decreases. This means that the pressure decreases in the narrow section, but increases again once the fluid returns to a wider section of the pipe. Therefore, the pressure does not remain the same or decrease, and it also does not fluctuate consistently. Thus, the correct answer is A: The pressure increases.

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