Astronomy Benalla
Reports - 2013
Whirlpool Galaxy m51 & companion galaxy ps07 (Hubble) Black Hole Butterfly Nebula (Hubble image) Sombrero Galaxy (Hubble) Home of Astronomy Benalla Carina Nebula Pillar - ps49 (Hubble image) Most photos on this site can be zoomed by clicking the photo
Astronomy Benalla  Meeting Presentations - Wednesday 15th May 2013 Presenter: Patrick Watson WHERE ON EARTH IS OUR HYDROGEN? CHEMICAL ABUNDANCE  IN THE UNIVERSE Helium is about 25% by mass and hydrogen about 73% with all other elements constituting less than 2%. It is clear then that hydrogen and helium make up 98% plus of the ordinary matter in the universe. But not on Earth! EARTH Composition of dry atmosphere, by volume We commence by asking a second question: What is the average speed of a hydrogen molecule (H2) at (SAY) room temperature , 20 C? Boltzmann Constant = 1.38 x 10-23 J/K 0oC = ≈273 K.      So,   20oC = (273 + 20) = 293 K Mass of a hydrogen molecule = mass of a hydrogen atom x 2  = 3.4 x 10-27 kg Now we know that In some situations, atoms and molecules in a gas may be moving so fast that they can overcome the attractive force of a planet’s gravity and escape into interplanetary space. ESCAPE SPEED SO???? SO??? A good rule of thumb is that a planet can retain a gas if the escape speed is at least 6 times greater than the average speed of the atoms or molecules. SO - WHERE ON EARTH IS OUR HYDROGEN  ->  HYDROCARBONS! A hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Methane Ethane Propane Butane Etc., etc., etc.,
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