Saturday, December 18, 2010

Our Portuguese friends visited us

We were visited by a group of Portuguese students from Loulé. They arrived at Torneo petrol station without having breakfast. So the first thing we did after introducing was precisely to go to a bar and had breakfast. At first it was a little difficult to get into contact but after a few minutes we began to speak with them.

Walking down Alfonso XII street we arrived at the Museun Square where some students told them about this historical place including the statue of our famous painter Murillo; it was funny because some of them understood "Mourinho" and we all laughed. Then, we continued to the Silencio church, where other students explained them briefly about the brotherhood.

As they wanted to know where to buy some presents, we told them they were just in the center of the town and showed them Duque square. Finally, after this tour, we went into the school. Sister Cocha and Marisol were waiting to greet them. Alexander, their teacher asked me about our school and the Spanish educational system , although he knew a lot because he had been working in a Spanish school for a short period of time.

Manu was at the Concert Hall (salón de actos) to share our experiments. It was perhaps the best part; that is to say, both groups joined by the same idea: Funny experiments connecting us.

After the experiments in our school, we began our little tour of about one hour and a half starting in Sierpes street and walking around the main commercial axis downtown. Then we reached Plaza de San Francisco and Seville’s immense cathedral. We had a fantastic view of La Giralda from Plaza de la Virgen de los Reyes, where we took some pictures.

We surrounded the old walls of the Álcazar until we finally entered Santa Cruz quarter (old Jewish neighbourhood with very narrow streets). From Plaza de Santa Cruz we arrived at the famous Plaza de Doña Elvira. After a short walk along Callejón del Agua and Murillo’s gardens, we found Seville University.

Finally we walked our way back arriving at Plaza Nueva, the city’s principal public square, until we finally reached Plaza de la Campana again, where Portuguese students were left to have lunch at a fast food place.

Alexander was explaining us that secondary education courses in Portugal have a duration of three years, corresponding to the 10th, 11th and 12th grades, and is open to students who have obtained the basic education certificate. Attendance to these courses is optional. Usually, students are aged between fifteen and seventeen.

There is a variety of secondary education options available to students. They can choose between courses aimed primarily at those seeking to enter the job market (technology courses) and others for those hoping to continue on to higher education (general courses).

All courses contain a technical, technological and vocational element, as well as Portuguese language and culture, in accordance with the general thrust of the course, and students are able to cross from one course to another. The curriculum is divided into subjects, with one teacher, in principle, for each subject.

Tuesday, December 14, 2010

Candle & jar

Experiment from Ania&Jessika

Necessry components:
plate, water, small candle, glass vessel (example a jar), matches
Description of the method of execution:
We pour water to the plate. In the middle ofthe plate we put a candle and light it.We cover the burning candle with the jar so that the outlet is submereged in water. We wait until the candle goes out (oxygen consumption as a result of burning of the candle) observing the water level rising in the jar.
During the burning of the candle oxygenis consumed. Oxygen is strictly reqired for combuston, so after firing up the oxygen in the jar candle goes out. Lack of oxygen in the jar is the cause of the underpressure in the jar. Due to the pressure difference between pressure in the jar and the atmosphere(which is greater), water is pulled into the interior of the jar.
In addition, burning the candle heats the gasinside the jar. The heated air expands while increasing the pressureinside the jar. Due to the pressure difference (between the gas pressure inside the jar and atmospheric pressure) of air comes out of the jar. After the candle goes out the gas temperaturein the jar gradually decreases, causin reduction in pressure in the jar and pulls the water inside.

Candle flame

Experiment from Ania&Jessika

Necessary components:
candle, funnel, matches
Description of the method of execution:
Light a candle. Blowing vigorously through the funnel next to a candle flame. Flame leans toward the blast.
Blowing next to a candle flame produces a stream of air. The air pressure outside the stream is greater than in its interior. The difference in pressure causes the outer layers of air movement toward the interior of the stream. Candle flame bends as indicating the direction of the resultant air movement.

Wednesday, December 1, 2010

Air in your lungs

For my experiment we need: a big plastic bottle, a big box and a hose.

Fill the bottle with water, close the neck of the bottle with your finger and put the bottle upside down into the box with water. Then push the hose into the bottle and blow into the hose as long as you are able without aspiration. Now you can see how much air you have in your lungs.

Tuesday, November 30, 2010

Descomposition of hydrogen peroxide

En español

In english

Balloon in a plastic bottle

I will try to inflate a balloon in a plastic bottle.
You see it does not work.
There is a way to make it work. Just make a hole in the bottle.
Now it works because the air from the bottle can escape, and it lets the air from your mouth go into the balloon.

Tuesday, November 23, 2010

Hairdryer and balloon

We need: a hairdryer, an inflatable balloon, a tube Drop the balloon in the stream of air from the hairdryer. The balloon will start flying. The reason the balloon stays in the moving stream of air has to do with Bernoulli's Principle. Bernoulli's Principle says that pressure decreases inside a stream of flowing air. When the balloon begins to move out of this low pressure stream, the higher pressure of the air in the room pushes it back into the moving stream.

Air and water

Can you blow up a balloon without blowing? You will need: a plastic bottle, an inflatable balloon, a knife, scissors, a container with water Procedure: Cut out the bottom of the bottle. Pull the inflatable balloon on the neck of the bottle. Then dip the bottle vertically into water. Explanation: Water penetrates into the bottle because of the snipped bottom. Air has lower density, so it is always above the water. The water pushes the air into the balloon. Try, on the contrary, to depress the balloon into the bottle. Air and water do not mix together. Air is always on top.

Jumping coin

Expansion of gasses We need a bottle and a coin. Put the bottle in a fridge to cool. Rub soap and pour water on the neck of the bottle a little bit. Put the coin on the neck of the bottle to cover it. Put your hands on the bottle, hold it fast and think hard about making the coin jump. In a while, it works! Your hands warm the bottle, the bottle warms the air inside, and warm air wants to escape. When the pressure of the air is great enough, the coin jumps.

Monday, November 22, 2010

Cup hanger

You need a balloon and two cups. Blow the balloon up a little bit. Then place the cups to the balloon and continue blowing. When the balloon is big enough, drop the cups. The cups are stuck to the balloon. While blowing the balloon up, the air inside the cup was pushed away a little bit. The air pressure outside the balloon pushes the cup to the balloon.

Tuesday, November 16, 2010

Obedient balloon

For my experiment we need: a bottle, a kettle of hot water, a balloon, cold water to cool the bottle down

Close the neck of an empty bottle with a rubber balloon and then put the bottle into the kettle of hot water. The balloon is gradually inflated. The heated air in the bottle expands and the growing pressure causes the balloon on the neck of the bottle to inflate. Then cool the bottle, reducing the temperature of the air inside the bottle. Colder air has lower pressure. External atmospheric pressure pushes the balloon inside the bottle.

Saturday, November 13, 2010

Ballon & glass

Materials needed:

- balloon
- glass
- candle

Description of how to do:

We fill the balloon with air and tie it with a line. Then we light a candle and nat a glass. Now we must link glass with balloon.

Why doesn't the glass fall down?
Because pressure in the glass is smaller than pressure in the balloon.

Bernoulli's effect

Experiments from Kasia & Asia
Useful staff:
- ping-pong ball
- high power hair dryer
Desription of the experiment:
we put outletof the dryer vertically so that it blows thw air upwards. Next we out the ballin the stream of thw air. Now, we can observe the behaviour of the ball which floas in the stream of air. This is called the Bernoulli's effect.
The stream of the air equals the earthpull of the ball. The pressure outside the stream of the air is bigger than the pressure inside of it. The experiment shows us the development offorces gragging the ball into the streamof air. According to the lawof Bernulli the outgoingair from the dryer's outlet decreases the static pressure in favour of the createddynamic pressure. It (the dynamic pressure)upholds the ball towards the direction of the outgoing air. Whereas the reduced static pressure holds the ball perpendicularly towardsit. The ball floats freely in the air.

Diffusion in liquids

Experiment from Ania&Jessika

Materials needed:
- 2 glasses
- hot and cold water
- ink
Description of how to do:
Fill glasses halfway with water. One of them fill cold water, and the other with hot. Instill few drpos of ink on the surface of water (after it has stabilized). We can now observe the phenomenon of diffusion in liquids of different temperatures.
Diffusion is a spontaneous spread of one substances in another one. The rate of the diffusion depends on the temperaure of the liquid. Diffusion occurs more rapidly in liquids at the higer temperatures. This experience confirms the molecular strucure of liquid and the disordered motion of molecules.

Saturday, October 23, 2010

Tuesday, September 14, 2010

Czech team just started

Czech students just started with their first experiments! And what about you?