Humboldt H-9340 User Manual

06.09

product manual

H-9340

Ball & Ring Demonstration

Instructions

Everyone knows that applying heat to an object increases its
temperature. But what really is going on when the temperature of
an object increases?

Temperature can actually be thought of as the amount of energy that
an object possesses. Increasing its temperature will add energy to the
object. When an object gains more energy, the molecules inside that
object generally become more excited. This can result in an object
vibrating, glowing expanding or a combination of all three.

Applying heat to most all solids will result in some sort of expansion of
that solid. The amount of expansion is determined by the amount of
heat applied, the time over which the heat is applied and the material
that is being subjected to the heat.

Different materials will expand at different rates. This rate is referred
to as the coefficient of expansion of that particular type of metal. For
example iron will expand .000012cm per centigrade for every cm of
length. Therefore iron's coefficient of expansion is .000012. But keep
in mind that the material expands in all directions. So not only does it
expand length wise but thickness wise also.

Begin by setting up your heat source on the table in a secure manner.
This heat source can be an alcohol lamp, torch, hot plate, etc. Hold
the ball and rod by the handle only. As you place the ball into the heat
source, the rod can become very hot.

nnmm

Hold the ring unit by the handle, in one hand, and hold the ball unit by
the handle in the other hand. Without forcing it, slide the ball through
the ring's opening. The ball and ring set is precision made so scratching
either the ball or the inside of the ring can prevent the ball from passing
through the ring smoothly.

2

Operation

Begin by heating the ball. After about thirty seconds to one minute of
applying heat (this depends on your heat source) try gently, but quickly
sliding the ball through the ring. What happens? You should find that
the ball would not pass through the ring.

Now, give the ring time to cool and once again try passing the ball
through the ring. As the ball cools you will find that it reduces in size
enough to allow the ball to pass through once again.

Before you perform the next experiment, try predicting what will hap­pen when the ring is heated. Then perform the experiment as before,
only this time heat the ring. What happened? Why?

Make sure that both the ring and ball are cooled to room temperature
before putting the set away.

Warranty

Humboldt Mfg. Co. warrants its products to be free from defects in
material or workmanship. The exclusive remedy for this warranty is
Humboldt Mfg. Co., factory replacement of any part or parts of such
product, for the warranty of this product please refer to Humboldt
Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is
responsible for the transportation charges. Humboldt Mfg. Co. shall not
be responsible under this warranty if the goods have been improperly
maintained, installed, operated or the goods have been altered or
modified so as to adversely affect the operation, use performance or
durability or so as to change their intended use. The Humboldt Mfg.
Co. liability under the warranty contained in this clause is limited to the
repair or replacement of defective goods and making good, defective
workmanship.

Humboldt Mfg. Co.

875 Tollgate Road
Elgin, Illinois 60123 U.S.A.

Testing Equipment for

HUMBOLDT

www.humboldtmfg.com

U.S.A. Toll Free: 1.800.544.7220

Voice: 1.708.456.6300

Fax: [phone]

Email: [e-mail]

Construction Materials