Model No.TD-8577
012-13028C
Operation
®
3
where
n
is the number of moles of gas,
R
is the gas constant, and
T
is the absolute
(thermodynamic) temperature. Solving the initial equation for
nR
and substituting the
expression into the final equation gives:
Solving for the final temperature,
T
, and substituting the final pressure,
P
, derived
from the adiabatic equation and the final volume,
V
, which is 1/15 the initial volume
gives:
Simplifying this expression gives
T
= 15
(
- 1)
T
0
. For air, which is mainly diatomic,
=
1.4, so this gives
T
= 15
0.4
T
0
. Assuming that the initial temperature is about 24 °C
(297 K), then
T
= 15
0.4
(297 K) = 877 K. Converting to celsius,
T
= 604 °C. Since
604 °C = 1120 °F, the temperature is high enough to ignite paper.
Operation
1.
Turn the removable base counterclockwise to unscrew it from the bottom of the
igniter. Remove the base and set it aside.
2.
Insert a small piece (~ 1 cm
2
) of tissue paper or a few strands of cotton fiber (e.g.,
pulled from the end of a cotton swab) into the bottom of the glass tube.
3.
Use the loading/cleaning rod to push the material up into the lower part of the
glass tube. Carefully remove the loading/cleaning rod without pulling the mate-
rial out of the lower part of the glass tube.
4. IMPORTANT
: Insert the piston into the top of the igniter and push it in far
enough that the end of the piston lines up with or is slightly below the
“Piston Starting Position” label on the outer tube 2.5 cm (1 inch) below the top.
5.
Replace the removable base by screwing it clockwise into the bottom.
6.
Place the base of the igniter on a sturdy horizontal surface and securely hold the
tube with one hand. Make sure that the combustible material in the bottom of the
glass tube is visible.
7.
Watch the piece of combustible material at the bottom of the glass cylinder.
8.
With the palm of your other hand, quickly slap down on the knob of the piston so
the end of the piston goes down into the cylinder rapidly.
Slap it down and keep
it down.
PV
P
0
V
0
T
T
0
----------------
=
T
PV
P
0
V
0
------------
T
0
15
P
0
V
P
0
15
V
---------------------
T
0
=
=
Piston Starting Pos
itio
n
Combustible
material
Piston
Push knob
down rapidly
Grip
tube
firmly
Watch
here
Piston Starting
Position label
Bottom
Top
Safety Tube
Glass Tube
Insert combustible
material here.
Removable
Base
