Lighter than air

The history of hot air balloons starts in the Asia. Literary references in China date back to 180ce and cite Chu Ko Liang as the inventor of lighter than air flight (1). Early unmanned balloons were used in China as military signaling lanterns (2). Today ethnic Chinese communities celebrate the end of the Lunar New Year Holidays (3) by launching small hot air balloons ( known as Kung-Ming Lanterns ). The first recorded mathematical description of buoyancy (and thus hot air balloon behavior) was

process works. To ascend, blimps use helium, a gas that is lighter than oxygen. Helium has an atomic weight of 4.002. The average weight of a blimp is 12,840lbs then after helium is added it can weigh 100 to 200 lbs. Today, most blimps use helium because of the Hindenburg disaster in Lakehurst, New Jersey during 1937. Most LTA (Lighter Than Air) aircrafts use helium now, but in the past they used hydrogen because it is even lighter than helium, but the problem with hydrogen is that is highly flammable

Purpose: The purpose of this science project is to determine if the yeast is alive. We know that many bacteria are alive, and we know the signs of life. These include breathing, moving, eliminating the body, and eating. If yeast displays these requirements, we can conclude that yeast is alive. Hypothesis: If yeast is combined with sugar, it will produce signs of gas, leading to the chemical reaction between sugar, water, and the shaking movement that is used to produce heat and movement,

ball can be optimized to give better performance. The objective of this research is to see if lighter gases than air will cause the football to have a longer hang time and if heavier gases than air will cause the ball to have a shorter hang time. Hang time means how long the ball stays in the air before it touches the ground. The researcher filled five footballs with different gases. The gases being air, helium,

the ball farther than normal, having an advantage during slippery weather,

variables were mass, surface area, height, and the force applied. Our dependent variable was the amount of time it took the object took to reach the ground. Lastly, our control variables were the type of object, height, planet, force, temperature, and air resistance. We then began our experiment by gathering all our materials for each factor that was being tested. We did our tests several times to get an accurate answer. For some of the tests, we could not figure out which object hit the ground first

Making Cars Lighter Cars have been around for many years. The first car to move off its own power was in 1769, and 1989 the average weight of a car was about 3,000 pounds. Overtime, cars have been through many changes and improvements. Car makers are constantly in search of improving cars to be better than the last. Can lighter cars be safer? Can the fuel economy benefit if the production of lighter cars were to increase? And lastly, what are alternative composites car makers can invest in? Making

climate. It's all caused by winds. Weather=changes in the air for a short period of time. Climate = a usual normal pertictuple pattern in the weather that happens often. The sun and climate The source of climate is the sun. It gives off energy for plants and animals need to survive. The suns ray gives warm the air,water and land we need to live. Warm liquids gases are lighter than cold gases and liquid. They are lighter

Recently, a new policy of Samoa Air, pay-by-your-weight, caused wide public concern. Some passengers are able to understand this rule, because Samoa has a small island-hopping airline and the obesity rates get close to the peak in this region. The others, however, can’t accept this inappropriate idea to discuss people’s weight. In my opinion, I agree with the latter, because weighing the pounds greatly destroys the honor system and the privacy. The honor system is an important tool to build a good

a decrease in food, and low lands are flooded, from melting glaciers. Humans are the major cause of global warming. We use electricity all the time; electricity is made by burning fossil fuels, when this is burnt greenhouse gasses are sent into the air. We are chopping down trees that absorb CO₂ (greenhouse gas.) The world needs to do something about global warming fast, before it is too late. Scientist have suggested many