# Expansion and compression of gases

The expansion and compression of gases, a really complete chemistry experiment showing easily main concepts of this phenomenon with gases in the air.

The idea is to create a magic balloon that inflates and deflates by its self. You can get the effect as many times as you want. I hope that these home experiments would be very useful for you.

#### Theoretical foundation:

The aerostatics balloons fly because the hot air expands until it weighs less than the air that surrounds it. The divers breathe under water thanks to the compressed air that it is in the tank, ergo a lot of air in a little space.

The gases can change its volume by a change of temperature or pressure. At more temperature and less pressure, they occupy more volume.

#### Materials:

• Plastic bottle
• Balloon
• 2 recipients
• Hot water
• Cold water with ice Read more

# Physics experiments for kids

With this physics experiment for kids we will try to to show the effects of changing position of center of gravity of an object.

#### Theoretical Foundation:

The center of gravity (CG) is the point of application of the resultant of all the forces of gravity acting in different portions of a body material, so that, the time for any point of the resultant applied at the center of gravity is the same that produced by all the mass weights of all materials constituting the said body.

Physics

In other words, the center of gravity of a body is the point at which the forces that gravity exerts on the different material points which constitute the body produce a zero resultant moment.

# Home barometer

This is a great Science experiment for kidshere we will try to explain and analyze the atmospheric pressure from the building of a home barometer.

In previous experiments we had checked the existence and the effect of the atmospheric pressure:

#### Theoretical foundation:

The barometer is an instrument used to measure the atmospheric pressure, ergo, the force per unit of surface made by the weight of the atmosphere.

The weight of the air exerts over the earth a pressure which is called “Atmospheric pressure”. This phenomenon was discovered by Evangelista Torricelli. He invented a tube called “Torricelli’s Tube” or barometer (From greek “baros” weight of “metron” measure) that was used to measure this atmospheric pressure.

# Home DNA Extraction

In this particular science experiments for kids the aim will be to teach how to make a home DNA extraction and understand its importance and uses.

#### Theoretical foundation:

DNA

The DNA is the chemical where are stored instructions which direct the development of an egg up to form an adult organism, which maintain its operation and allow inheritance. It is a molecule of great length, which is formed by aggregating three types of substances: sugars, called deoxyriboses, phosphoric acid, and four types of nitrogenous bases, adenine, guanine, thymine and cytosine.

The DNA Testing is the most accurate and effective test available to determine family relationships. It is widely accepted by the courts of law, the immigration service and Naturalization Service of the United States, and many other government agencies.

DNA testing proves or disproves paternity in all cases. Each test report clearly indicates whether paternity: Read more