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Chapter 12: Problem 21

Explain why liquids, unlike gases, are virtually incompressible.

Short Answer

Expert verified
Liquids are virtually incompressible because their particles are tightly packed with little empty space and strong intermolecular forces resist compression.

Step by step solution

01

Define Compressibility

Compressibility refers to the ability of a substance to decrease in volume under pressure. For a substance to be highly compressible, its volume must change significantly when a force is applied.
02

Analyze Particle Arrangement in Liquids

In liquids, particles are closely packed together but still have enough space to slide past each other. This arrangement means there is very little empty space between the particles.
03

Compare Particle Arrangement with Gases

In gases, particles are far apart with a lot of empty space between them. This means gases can be compressed easily as the particles are pushed closer together under pressure.
04

Discuss Molecular Forces in Liquids

Liquids have stronger intermolecular forces than gases, which keep the particles close together and resist compression. This means even when force is applied, the liquid's volume does not change much.
05

Conclude on Liquids' Incompressibility

Due to the close packing of particles and strong intermolecular forces, liquids cannot be compressed significantly, making them virtually incompressible.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Compressibility
Compressibility is all about how a substance can change its volume when we apply pressure to it. Imagine squishing a sponge. It reduces in size because there are tiny air pockets that can be pressed together easily. For a material to be compressible, it must have spaces within it that can be squeezed.

Liquids, however, don't have these empty spaces. When pressure is applied, they don鈥檛 have the room to compress. This inherent resistance to volume change makes liquids virtually incompressible compared to gases.
Particle Arrangement
The arrangement of particles in a substance significantly influences its compressibility. In liquids, particles are packed quite closely. They touch each other, leaving nearly no empty space in between. This arrangement allows them to slide past one another, which is why liquids can flow, but there's simply no space to compress.

In contrast, the particles in gases are widely spaced. The gaps between gas particles mean the particles can be pushed closer together, allowing gas to compress significantly under pressure.
Intermolecular forces
Intermolecular forces are like invisible strings holding particles together. In liquids, these forces are much stronger compared to gases. They hold the particles in a liquid snugly next to each other.

When pressure is exerted on a liquid, the strong intermolecular forces resist the particles being pushed closer together, maintaining a stable volume. On the other hand, gases with weaker intermolecular forces allow their particles to move freely, making them easy to compress as there鈥檚 little resistance to the movement of particles.
Liquids vs Gases
Comparing liquids and gases is key to understanding their compressibility. The main differences lie in particle arrangement and intermolecular forces.
  • **Liquids**: Particles are close together with strong forces; almost incompressible.
  • **Gases**: Particles are far apart with weak forces; highly compressible.
These distinctions make gases suitable for applications where compression is necessary, such as in engines and sprays. Meanwhile, the incompressibility of liquids makes them useful in hydraulic systems where pressure transmission is vital.

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