Smoke without fire

Smoke without fire:

As result of reaction of acid with a base, salt is forced this
 can be chemically given in the formulae. you can conduct this
simple experiment.

smoke

HCL+NH3=NH4CL
(smoke without fire)

Materials you need are:

Make your own telescope?

Make your own telescope?

Telescope:
An optical instrument for making distant objects appear
larger, make or become shorter by sliding each section
inside the next; compress or become compressed forcibly.
Telescopes are of two kinds. refractors and reflector type.
The refractors telescopes use lenses which bend the light rays
and the image is seen as magnified object. Reflector telescopes
are mirrors to display the image. There are three kinds of
telescopes they are Galilean, Newtonian and cassegranian.

Materials to make your own telescope:

light a light bulb with a balloon

light a light bulb with a balloon 

you need:

hard rubber comb or balloon
a darken room
fluorescent light bulb ( not an incandescent bulb )

SOUND LENS USING A BALLOON

SOUND LENS USING A BALLOON

A ballopn full of CO2 gas can act as a  sound lens, because sound travels
More slowly in CO2than it does in air ,

MIXING COLORS

  MIXING   COLOURS

You need
A pencil, Scissor, White cardboard or heavy white paper
crayons or markers, a ruler
a small bowl or a large cup (3-4inch, or 7-10 cm diameter rim)
 a paper cup
What to do