The changes that occur during a star ’s life are called stellar evolution. The mass of a star determines the ultimate fate of a star. Stars that are more massive burn their fuel quicker and lead shorter lives. Because stars shine‚ they must change. The energy they lose by emitting light must come from the matter of which the star is made. This will lead to a change in its composition. Stars are formed from the material between stars‚ shine until they exhaust their fuel‚ and then die a predictable
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Noble Gas | Uses | Property | Argon | Light bulbs | Doesn’t react with the metal filament | Helium | Used with O2 for deep sea dives | Low solubility of helium in the blood. | Helium | To inflate the tyres of large aircraft | Non-flammable | Helium | To fill airships and weather balloons | Low density‚ does not burn | Neon | In advertising signs because it glows red when electricity passes | Conductor of electricity at high voltage | Krypton/Xenon | In lamps used in photographic flash
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nebula‚ a cloud of dust and gas‚ which contains large amounts of hydrogen and helium. The nebula then condenses into a sphere that temperature rises because of gravity and shockwaves. This condensed nebula is called a protostar‚ which is defined as a sphere of gas with high temperatures. The temperature gets hot enough to fuse hydrogen into helium and this ignites the protostar into a star. Once the Vega fuses hydrogen into helium‚ it is considered to be a part of the main sequence. The star is balanced
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Anatomical dead space and functional residual capacity (FRC) play a very important role to ensure the constancy of alveolar gas tensions. Firstly it is important to understand what the anatomical dead space and FRC actually are. The anatomical dead space refers to the gas in the conducting areas of the respiratory system where air does not come into contact with alveoli. Examples of places in the respiratory system where anatomical dead space is present are the mouth and trachea. The functional residual
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footballs were filled with helium. They experimented with football filled with helium and air to see which one goes farther and the results concluded that helium and air go the same distance (Wikening‚ 2013). This meant Ray Guy was kicking regular footballs. Since then similar research has been done with the helium football problem. Ohio State University and Carnegie Melon University concluded that “there is not much difference in the results for the two footballs” (“Helium football story”‚ n.d.). The
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knowledge of astronomy. A star’s life begins as simply a clump of gas known as a molecular cloud. Molecular clouds are very cold‚ around 10-30 K‚ and have a density of about 300 molecules per cubic centimeter. These clouds are full of hydrogen and helium and often contain heavier elements expelled from a large exploding star known as a supernova. There are over 120 different molecules in molecular clouds including carbon monoxide‚ water‚ ammonia‚ and ethyl alcohol. A protostar is the next step in
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This composes the upper 25% of the planet. Next‚ the hydrogen thins out into the gaseous atmosphere which is 1000 km (620 miles) deep. It is composed mainly of hydrogen and helium with trace amounts of methane‚ water‚ ammonia‚ and hydrogen sulfide. Some scientists believe that there are also polysulphur compounds and phosphine which lend their colors to the clouds. Jupiter also has a faint ring system. It is comprised of one
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Student Instructions: Why does a hot air balloon float even though it is so heavy? Hot air balloons float because the buoyancy force of the hot air is more than the weight. Buoyancy occurs because the hot air has a lower density than the cooler outside air. This lower density air weighs less than the air it replaces and that difference is the buoyancy. What makes balloons float when they are full of air but not float when they are deflated? Balloons float when they are full of hot air
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Thermodynamic Investigation of the Joule-Thompson Effect and Coefficient Determination for Helium and Carbon Dioxide Niki Spadaro‚ Megan Cheney‚ and Jake Lambeth University of North Florida‚ CHM4410C Fall 2010 The Joule-Thomson coefficient explains the behavior of any real gas when changes in intensive properties‚ such as temperature and pressure‚ occur. The coefficients for helium and carbon dioxide were determined using a Joule-Thomson apparatus that created constant enthalpy within the
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gasses; oxygen‚ carbon dioxide‚ helium‚ and lab gas. We took a Ziplock bag‚ and turned into a non-stretchy balloon‚ and filled with each gas and measured the apparent mass then calculated the actual mass‚ then find a ratio between the mass of oxygen and the other gasses. We tried to keep the pressure about the same each time so our calculations would be more accurate. We found out that the heaviest was carbon dioxide‚ and the lightest was helium. In fact‚ helium and lab gas had a density below
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