En este nuevo Laboratorio en casa te enseñaré como hacer un lanzallamas casero utilizando harina de trigo. Recuerda que este tipo de experimentos donde se requiere de fuego, es importante hacerlo bajo la supervisión de algún adulto responsable.
Materiales
3 Velas
2 Platos pequeños
1 Pajilla (sorbete, pitillo, popote)
1 encendedor
Harina de trigo
Procedimiento
Coloca 3 velas en un recipiente de manera que queden en fila de menor a mayor altura.
En un plato pequeño añade gran cantidad de harina de trigo.
Acerca la pajilla al plato que contiene la harina a una altura moderada de las velas y sopla enérgicamente. (No debe haber nadie delante de ti cuando soples, ya que hacia ese lado emergerá una llamarada)
Observarás como se forma una gran llama.
Pero, ¿por qué ocurre esto?
Cuando se sopla con fuerza las pequeñas partículas de harina, estas empiezan a expandirse de forma rápida y distanciada parecido al efecto de un spray. Las partículas se envuelven del oxígeno del aire y al pasar por la llama de la vela benefician la combustión por lo que se queman fácilmente cada una de ellas, aumentando el volumen de la llama.
Una sugerencia, para hacer un semi explosivo o simplemente una mezcla con gran efecto de deflagración recomiendo probar mezclarlo con nitrato de potasio, esto debería darle el oxígeno suficiente para que pueda quemarse sin necesidad del aire.
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