How can I make a bottle rocket Using the compass, trace and cut out a circle shape (5 cm across) on paper. Cut into the middle of the circle and fold one flap over the other until a cone shape is formed. Use a small piece of tape to hold the paper cone together. Cut a small hole at the point of the paper cone and fit the head of a cotton swab head through it. Place the cotton swab with its attached paper cone inside the top of the straw. Point your rocket away from yourself and other people and give the bottle a hard squeeze. Air takes up space. There is air inside the bottle before you squeeze it. When air is compressed its pressure increases, so when you press on the sides of the bottle, you are increasing the pressure inside it. Air does not like high pressure situations, so it tries to move to an area of low pressure (in this case, outside the bottle). The air rushes out through the straw and causes the rocket to zoom and "take off!" Why does it matter? Air pressure is an important dynamic in our lives. Though it is difficult to feel, the air around us is not always at the same pressure. At higher altitudes (like on mountains), the air becomes "thin" because the pressure decreases so much. In those cases, it may become harder to breathe. Similarly, air pressure is used by meteorologists (scientists who study the weather) as an indicator of the weather. Low pressure systems are prone to rain, whereas high pressure systems tend to be sunny. This is why weather reports talk about high or low pressure fronts. By determining how the air travels between high and low pressure areas (remember, air likes to move towards low pressure areas), meteorologists are able to estimate wind speeds and temperature changes.
cigarette vapors questioned That’s according to research by Maciej Goniewicz, an assistant professor of oncology at Roswell Park Cancer Institute’s Department of Health Behavior, published by the journal Nicotine and Tobacco Research. Goniewicz and his team studied vapor from three different brands of e cigarettes, as well as secondhand smoke exposure of vapors and tobacco smoke generated by dual users. The results showed the e cigarettes emit nicotine at levels of about 10 times less than conventional tobacco cigarettes,
Wholesale NBA jerseys though they did not emit substantial amounts of carbon monoxide and toxic volatile organic compounds. Surgeon General has not yet evaluated the short and longterm health risk from secondhand exposure to vapors. "We don’t know yet the longterm affects of using these products," Goniewicz said. "We know there are some traces of some potentially dangerous chemicals in the vapor. We don’t know what will happen after 10 20 years of inhaling this vapor." Still, vaping is considerably less dangerous than regular cigarettes,
Cheap NFL jerseys since users and those around them are exposed to significantly less toxins. "The clear conclusion is that these products are safer than tobacco cigarettes. When you compare them, we believe these products are safer than tobacco cigarettes, but there is no doubt for smokers that quitting is the best way," he said. The other growing issue is how to handle vaping indoors, including in public places, restaurants and the workplace. The Food Drug Administration and individual states place limits on advertising and how and where tobacco cigarettes are sold, but there have not yet been any rulings on exactly whether e cigarettes fall into the same category. A number of companies have already taken steps to limit vaping in the workplace, while in other places, it’s the state or municipality making the rules: New York City Council in December voted to ban the use of e cigarettes in all places where smoking is prohibited.