What type of oxygen do we breathe

This has a very important job. Nitrogen slows down the burning process so you get enough energy through the day, bit by bit. If you breathed pure oxygen, the energy from your food would be released all at once. So forget candles. This is more like a firework exploding. But you would damage your body. Read more: Curious Kids: when I swipe a matchstick how does it make fire?

Breathing pure oxygen sets off a series of runaway chemical reactions. Oxygen radicals harm the fats, protein and DNA in your body. Open the bottle, and try to compress the bottle again. It is much easier. The air presses back with a much reduced force.

Unless something blocks the movement, air will move from areas of high pressure to areas where the pressure is lower, and this is what happens when air rushes in or out of the lungs.

When the chest cavity expands there is more space around your lungs. In this condition the lungs can expand, making it a low-pressure area, and air rushes in to balance out the difference in pressure.

Then to breathe out the chest cavity and lungs shrink. This raises the air pressure in your lungs, and the air rushes back out. This activity brought to you in partnership with Science Buddies. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Go Paperless with Digital.

Materials Disposable empty transparent bottle 10—16 fluid ounces made of hard plastic such as a sports drink bottle Ruler Two balloons 8-inch balloons work well Utility knife have an adult help and use caution when using the knife Adult helper Scissors Drinking straw optional Modeling clay optional Tape optional Additional balloon optional Preparation Ask an adult to cut the plastic bottle. Place the cut bottle down on the wide opening. Lower a balloon into the bottle until only part of the balloon's neck sticks out.

Fold the neck of the balloon over the top of the bottle. The balloon represents a lung. Turn the bottle over keeping the balloon inside so the bottle top rests on the table. In the next steps you will create and add the diaphragm to your model. Make a knot in the neck of the second balloon.

At the opposite side of this balloon cut off about a third of the balloon so you are left with a wide opening. Stretch the wide opening of the cut balloon over the wide opening of the bottle. Pull the edges of the balloon far enough up the bottle so the balloon surface is gently stretched. Make sure that the knot is on the outside and located near the middle of the bottle opening. Like an inflated balloon our lungs are full of air. We have two lungs, which are enclosed in the ribcage and protected by 24 ribs.

When you breathe in, air flows into your lungs. When you breathe out, air flows out of your lungs. The balloon inside the bottle is like one of your lungs.

The bottle is like your ribcage. Procedure Hold the bottle so you can see the balloon inside representing the lung. Gently pull down on the knot. What happens to the balloon inside the bottle?

Let the knot come back to its neutral position and then gently push it in. What happens to the balloon inside the bottle now? Repeat these steps a few times. Almost all local councils here follow the European scheme, ie: odd numbers on the left side, as viewed from the datum point at the start of the road, and even numbers on the right.

One of the few things they manage without risking the appointment of an administrator. The odd versus even system is found in most English speaking countries, with the odd numbers being assigned to the western or southerly aspects of a street. In Australia, the boundary between councils may instigate a restart in numbering. In rural areas where properties are sparse, numbers may be related to the distance from a road's origin. For example a roadside box number would be m from the roads start.

The numbering starts from the end closest to the marker with the number one on the right, 2 on the left and so on. It's a dexter conspiracy. As in Europe, Australian addresses use odd numbers on the left side from where the street begins and even numbers on the right. The street usually starts at the closest point to the nearest GPO in a town or city. Napoleon has often been credited with the idea of odd numbers on one side and even on the other.

But different councils have different policies. In Manly, our family home was No 3 on our road; it was on the left. In Elderslie Camden Municipality , we're No 22 on our street and still on the left. Odd, isn't it? England had an assistance treaty with Poland, and therfore they would have declared war on Russia.

We never hear about the fact that England should also have declared the war on Russia in and not just Germany when they both carved up Poland. It may be a more interesting question to ask: If World War I had ever happened, would Adolf Hitler ever have come to power?

Hitler took Germany into World War II on the back of the failure of the Weimar Republic, rampant poverty and the perceived unfairness of the Treaty of Versailles, which had caused outrage among German nationalists.

If Adolf had been bumped off in World War I, it's more than likely that some other fanatic would have plunged the country back into war. The Nazi Party gained power by exploiting rampant nationalism, including anti-semitism and anti-communism, and propaganda. The ruthlessness of the Nazi takeover may have allowed any leader to take them to war, but in the end it was Hitler's charismatic oratory that erased any misgivings the people might have after WWI, urged them on to fight for Lebensraum "room to live" , and carried them into the ultimate conflict.

The tension between Japan and the USA would have sparked off a Pacific war and the tension which later produced the Cold War would have come forward to bring on a conflict in Europe.

Eventually yes. Hitler was the catalyst for World War II to happen, but he wasn't the only dictator. Stalin was worse than him and Mussolini was pretty extreme too. During that time there were rising and dying empires, much political turmoil in Western and Eastern Europe creating an opportunity for rulers intent on forging their own empire.

Don't forget Japan's ambitions on the other side of the world too. So, the age of monarchial colonial expansionist type societies was bound to come to an end at some time.

Of course some things might have been different; perhaps the holocaust would not have happened. The fear of a communist revolution, reparations, poverty, unemployment, uncontrollable inflation, wounded national pride, rampant nationalism, ethnic hatred and inherent militarism were just some of the reasons that made war inevitable. Faced with a Britain and France stroking the rottweiler and a US examining its own navel, Hitler was just one of any number of demagogues ready to pounce.

It probably wouldn't have happened. Hitler joined politics after the bitterness that followed WWI with the Treaty of Versailles to try and as he saw it avenge Germany. His policies were all aimed at recreating a German empire - a Grossdeutschland, which would restore the sense of German pride and honour as retaliation to the terms in the Treaty.