The document describes an experiment to create a smokefall using a bottle, lighter, and piece of paper. It provides the materials, procedure, and result. The procedure involves making a hole in the bottle top, inserting a lit piece of paper through the hole, which causes smoke to fall down inside the bottle rather than rise due to lack of convection currents inside the sealed bottle. The result is explained by the dense smoke particles falling downward instead of being carried upward by hot air as they normally would.
8. Proyectos
Similares
How to Make a Smoke Ring Launcher
How can you make the invisible ring of air visible?
With a little smoke, of course. The best smoke
rings are made by filling the trash can with
theatrical smoke. Smoke machines (foggers) are
commonly used in stage productions. Check to
see if your theater department has one, or see if
you can borrow one from the disc jockey who
plays for your school dances.
The best smoke rings are also made by gently
tapping the shower curtain. A hard smack results
in a fast blast of air that is difficult to see. The
flying vortices are best seen against a dark
background with light coming from either side.
9.
10. Does smoke rise or goes down?
First we do a couple of holes in the bottle of plastic, one in the top part and another one
near the base of the bottle.
Then we take the sheet paper and cut away a rectangle of 10x15 cm.
We coil the paper to obtain a small cylinder of approximately 15 cm of length.
Finally the small tube of paper interferes for the top hole of the bottle.
On having ignited the small tube of paper with a match a small flame is formed and is
observed that for another end of the bead there goes out a column of very dense smoke
that falls down inside the bottle. In the exterior scarcely there is smoke.
If we cover the low hole with a finger the small tube of paper goes out and smoke does
not go out.
Explanation:
On having burned the small tube it departs from the paper it is clear in the shape of
particles that, together with the gases that are formed in the combustion and the air they
form the smoke.
In normal circumstances, the smoke ascends dragged by the warm air of the
combustion (currents of convection).
In our experiment, the smoke that takes place is produced in the interior part of the small
tube travels along it.
Inside the bottle there is no warm air, so that when the smoke goes out for the low end of
the small tube there do not take place (there are not produced rising currents of
convection) and the smoke (denser than the air) it rushes to the bottom of the bottle.
11. Smoking beagle experiments
Dr. Oscar Auerbach
At one point, He"trained" 86 beagles to
smoke in experiments where 12
developed cancer. It was said to be the
first instance of tumors produced in
large animals exposed to tobacco
smoke. However, it is not clear why this
particular study was given validity over
previous studies in large (and small)
animals, which failed to produce
cancer. The American Cancer Society,
which financed much of the research,
announced that the results "effectively
refute contentions by cigarette-
manufacturing interests that there was
no cigarette-cancer link." The response
of the Tobacco Institute, an industry
trade group, was that it was
"impossible" to draw conclusions from
work on dogs subject to such
"stressful" laboratory conditions."
12. Ferias Mundiales de Ciencia
Feria Mundial de Ciencias de
Google
La feria de ciencias de Google
ha comenzado. Y Google cree
que fomentar la competencia
en el campo de las ciencias así
como se fomenta en los
deportes o en la música, sobre
todo en los mas jóvenes, es el
verdadero futuro. Por lo que
junto a CERN, The LEGO
Group, National Geographic
and Scientific American
idearon la Google Science Fair,
La Feria de Ciencias de
Google en la que los
participantes deberán tener
entre 13 y 18 años y el único
requisito es tener una
computadora, una conexión a
internet y un navegador.
13. Ferias Mundiales De Ciencia
Las ferias mundiales y la fascinación con la ciencia y
el progreso.
A partir de la segunda mitad del siglo XIX, tres tipos de
exhibiciones y exposiciones adquirieron presencia:
La primera fue la Exhibición Industrial, dedicada al estímulo
de una industria específica, o de todas las industrias de un
determinado país o región. Ejemplos de este tipo fueron la
exhibición de productos de cuero en Berlín, 1877;de
impresión en Nueva York, 1900; y de artes modernas,
decorativas e industriales en París, 1925. Un segundo tipo
de exhibición, fue regional y dedicada a la conmemoración
de eventos históricos. Este tipo de ferias es particularmente
popular en los Estados Unidos. Dentro de este tipo estan la
exposición de los grandes lagos en Cleveland, 1936. El
tercer tipo, son las Exposiciones Mundiales que
generalmente son patrocinadas por un gobierno nacional y
presentan una amplia variedad de productos. Estos
eventos han llegado a convertirse en elaborados sitios de
exhibición para desarrollos técnicos y culturales, así como
