Journal of 9/11 Studies 38
April 2007
PROOF THAT THE THERMAL AND GRAVITATIONAL ENERGY
AVAILABLE WERE INSUFFICIENT TO MELT STEEL IN THE TWIN
TOWERS AND 7 WORLD TRADE CENTER ON 9/11/01
By Terry Morrone.
Professor Emeritus of Physics, Adelphi University
In this communication I shall show that only explosives could have produced
the large amounts of molten steel found at the site of the World Trade Center (WTC)
in the days following 9/11. There is universal agreement by scientists in and out of
government that the temperatures reached in the fires were much lower than the
melting point of steel. (1-3) Steel could have only have melted (assuming no
explosives were used) if it gained additional energy in falling. I shall show that this
gravitational energy is insufficient to cause melting.
Steven E. Jones has made a strong case that some molten steel (or iron-rich
metal) was observed pouring from high up in the South Tower (4). In that case
gravity was not a factor. However, much more molten steel was probably found in
the rubble than was observed pouring out of the buildings, and the purpose of this
report is to show that gravity could not have played a significant role in its formation.
Although there are some technical points involved in my arguments, I will
describe, in an elementary way, all the scientific concepts involved. This report will
also provide references showing that molten steel was indeed found.
Unit of Energy
I will use the joule, the unit of energy in the metric system. One joule per
second is a watt. We're all familiar with watts since light bulbs are rated in them. For example, a 100 watt light bulb uses up energy at a rate of 100 joules per second.
Another common unit is the calorie. One calorie is 4.186 joules. This is not the
calorie used in rating foods, which are rated in kilocalories or Calories (calories with
a capital C). A human uses up about 2000 Calories a day which is approximately
equivalent to the rate of energy usage of a 100 watt light bulb.
Journal of 9/11 Studies 39 April 2007
Heat of Fusion
Suppose you start off with a solid at room temperature and you add energy to
it by putting it in an oven. The temperature will increase until you reach the melting
point. Then as the solid melts the temperature will stay constant until the all solid has
changed to the liquid. Then the temperature will begin to increase again. An example
of this occurs when you take an ice cubes out of the refrigerator and put them in a
glass. The ice cubes heat up and then start to change to liquid water. This occurs at
32 degrees Fahrenheit or 0 degrees Centigrade. Then, after the ice has melted, the
water heats up to room temperature. The melting point of steel is at about 1535
degrees C. The energy required to change steel from solid to liquid is called the heat
of fusion and it's about 272,000 joules per kilogram. (5)
Heat Transfer
Energy flows from hot to cold. It never flows the other way. Thus it is
impossible for a steel bar, initially with the same temperature throughout, to, by
itself, transfer energy so that one end is hotter than the other. Thus in spite of the
large fires in the WTC, no steel could melt unless the temperature rose above the
melting point. And according to tests conducted by NIST, no WTC steel samples saw
temperatures of 600 C, which is well below the melting point of steel. (6)
Specific Heat
This is the amount of energy required to raise a unit mass of a substance, one
degree. For example at room temperature the specific heat of iron is 0.45 joules per
gram per degree Centigrade. (7) The temperature has to be specified since the
specific heat varies with temperature. The specific heat of iron is about the same as
the specific heat of steel. It increases with temperature, reaching a value of about
0.72 Joules per gram at 1400 degrees C. (8)
Energy Acquired by a Falling Body
A falling body is accelerated by the force of gravity. This is, according to one
of Newton's Laws, equal to the mass times the acceleration of gravity, which in the
metric system is 9.8 meters per second per second. Actually when a body falls, it is Journal of 9/11 Studies 40 April 2007
also acted on by the force of friction. In the spirit of giving the official theory every
possible chance, we shall neglect friction. The energy acquired by a falling body is
equal to the product of the force multiplied by the distance through which the force is
applied. Thus the energy acquired by a body of mass m falling a distance h is m*g*h,
(meaning m times g times h). The energy acquired by a 1 kilogram object falling
from the top of one of the twin towers is thus 1* 9.8*411 = 4028 joules. (The height
of the twin towers was about 1350 feet or 411 meters.)
Energy Needed to Melt Steel
Now let's first calculate the energy needed to raise the temperature of one
kilogram of steel from an initial temperature to the melting point temperature. The
NIST (1) report on page 30 states that the temperature of insulated steel in a fire
never gets above 350 degrees C, while uninsulated steel can reach a temperature of
800 degrees C. According to the official theory much insulation (which is used in all
steel frame buildings) was knocked off the steel beams by the impact of the planes.
Of course, 7 WTC was never hit by a plane and molten steel was found in its
wreckage. The actual temperature of the steel was probable never higher than 250
degrees C (3), but let's be conservative and use the 800 degree number. The average
specific heat between 800 degrees C and the melting point (1536 degrees C) is about
.65 joules per gram per degree C or 650 joules per kilogram per degree C. (Note the
energy is proportional to the mass, so a kilogram needs a thousand times more
energy to raise its temperature a degree as a gram.) Thus the energy needed to raise
the temperature of a kilogram of steel from 800 degrees to the melting point is
(1536 – 800)*650 = 478,400 joules.
The energy needed to melt one kilogram of steel is 272,000 joules as described
above. Thus the total energy needed to melt one kilogram (or per kilogram) is
272,000 + 478,400 or 750,400 joules.
Let's be generous and assume that all the energy of motion of the falling steel
is converted to heat in the steel. Then the gravitational energy available as shown
above is at most 4028 joules. This is a lot less than the 750,400 joules needed to melt
the steel. In fact the gravitational energy is too small by a factor of 750,400 divided
by 4028, or 186. The factor is probably much larger because, for example, all the
molten steel probably did not fall from the top floor and in the case of WTC 7, the Journal of 9/11 Studies 41 April 2007
building height is about half that of the towers. A more realistic number would be
over a thousand.
How the Steel Was Melted
Steven E. Jones, obtained several samples of once melted steel (or iron-rich
material) from the WTC (4,9). He had it analyzed and it contained mostly iron but
also Sulfur and other metals indicating that it was produced by the reaction of
thermate and steel. Thermate is a variation of thermite, which can be an incendiary or
explosive depending on the fineness of the powders comprising the mixtures. Ultrafine powders (less than about 100 micron particle size) are needed for the explosive
form. Thermite analogs can be used in building demolitions. (10) When thermite is
ignited a chemical reaction takes place that produces molten iron and lots of heat.
Sulfur is added to enhance the melting of steel by the molten iron product.
Sulfur
was also found, independently, in steel from WTC 7 by J.R. Barnett. (11)
D.P. Grimmer showed that a few inches of thermite applied to the outside of
any column in the twin towers would contain enough energy to melt through the
column; enough could be used to bring the buildings down. (12)
Evidence That Molten Steel Was Found in the WTC Debris
In James Glanz's New York Times 11/29/2001 Article “A Nation Challenged:
The Sight; Engineers Have A Culprit in the Strange Collapse of 7 World Trade
Center: Diesel Fuel.” The next to last paragraph reads “A combination of an
uncontrolled fire and the structural damage might have been able to bring the
building down, some engineers said. But that would not explain steel members in the
debris pile that appear to have been partly evaporated in extraordinarily high
temperatures, Dr. Barnett said.”
In the website
http://911research.wtc7.net/wtc/evidence/moltensteel.html
several references to reports of molten steel are cited. Here are a few examples:
A report by Waste Age describes New York Sanitation Department workers moving
“everything from molten steel beams to human remains.”
Journal of 9/11 Studies 42 April 2007
A report on the Government Computer News website quotes Greg Fuchek, vice
president of sales for LinksPoint Inc. stating: In the first weeks, sometimes when a
worker would pull a steel beam from the wreckage, the end of the beam would be
dripping molten steel.
A Messenger-Inquirer report recounts the experiences of Bronx firefighter “Toolie”
O'Tolle, who stated that “some of the beams lifted from deep within the catacombs
of Ground Zero by cranes were dripping from molten steel.” See also:
http://www.pnacitizen.org/john_gross_nist_pnac.php
Conclusions
Since there was molten steel in the wreckage of the World Trade Center,
and since the temperatures of the fires were insufficient to melt steel, and since
the gravitational energy was shown to be very much smaller than the energy
needed to melt steel, the Twin Towers and 7 WTC could only have been brought
down by explosives or cutter charges.
[References available at,]
http://www.journalof911studies.com/volume/200704/ProfMorroneOnMeltingWTCsteel.pdf