---
title: "Incompressible Fluid — AP Physics 2 Definition & Guide"
description: "An incompressible fluid has constant density, so volume doesn't change under pressure. This assumption powers the continuity equation and Bernoulli's equation in AP Physics 2."
canonical: "https://fiveable.me/ap-physics-2-revised/key-terms/incompressible-fluid"
type: "key-term"
subject: "AP Physics 2"
---

# Incompressible Fluid — AP Physics 2 Definition & Guide

## Definition

An incompressible fluid is a substance that does not change its volume when subjected to external pressure.

## Related Study Guides

- [1.7 Conservation of Mass Flow Rate in Fluids](/ap-physics-2-revised/unit-1/conservation-mass-flow-rate-fluids/study-guide/NA8kKB2JOKmsUHEpaOmr)

## Review

### Related Terms

- Compressibility: It refers to the property of a substance that can be compressed or has the ability to change its volume under external pressure.
- Pascal's Law: This principle states that when there is an increase in pressure at any point in an enclosed fluid, there will be an equal increase at every other point in the container.
- Hydrostatic Pressure: It is the pressure exerted by a fluid at rest due to the weight of the fluid above it.