Download Unit III- Introduction - Varga

UNIT III- INTRODUCTION

-
-
There are several important topics that we will
cover in this unit:
Viscosity and the particle theory of matter
The density of fluids
The buoyant force that liquids exert on objects
that float on them
How these things are important
Viscosity & The Particle Theory

Do you remember the particle theory of matter?
How do different phases of matter look like at the
molecular level?



The particle theory states that all matter is made
of tiny particles.
The particles are always moving around and
vibrating.
Particles are spaced differently in solids, liquids,
and gases.


When heat is added to particles, the particles will
move faster. As a result the state of matter may
change.
Different substances are made of different
particles.
Solids


In solids, particles are held tightly together with
strong forces.
Particles do not move, but they can vibrate.
Liquids


Particles are in contact with each other, but only
have weak forces between them.
The particles are able to slide past each other.
Gases

Particles are far apart from each other.

There are few, if any, forces between them.

Particles are able to move freely.