The lightest gas is hydrogen. This element is lighter than air and was used in dirigibles, or blimps, until deemed unsafe. Hydrogen is in the topmost layers of Earth's atmosphere because it rises above other gases.Know More
Hydrogen is light because it is the least-massive element on the periodic table. Hydrogen has a single proton and a single electron, but only the proton gives it any significant mass. Hydrogen weighs only 1 atomic mass unit.
Only objects such as stars and giant planets such as Jupiter with massive gravitational pulls can hold onto this lightest of elements. In Earth's atmosphere, hydrogen atoms collide with atoms of other gases. These collisions provide enough force to hurl light hydrogen atoms into space; therefore, hydrogen is found only in trace amounts in Earth's atmosphere.Learn more about States of Matter
The chemical equation for the combustion of hydrogen is 2H2 + O2 → 2H2O. During hydrogen combustion, the heat from burning makes hydrogen chemically react with oxygen gas, O2, in the air to form water.Full Answer >
The process of a gas changing to a liquid is called condensation, and for condensation to take place, the environment has to reach maximum vapor pressure, generally through a lowering of temperature in the case of the water cycle. Because pressure varies inversely with temperature, as temperature decreases, pressure goes up, causing the gas molecules to move with progressively less kinetic energy. Eventually, liquid vapor and droplets form, and the gas begins to condense.Full Answer >
Fire is primarily composed of several gases ignited by a source of heat and exposure to oxygen. Visible flames are the result of the energy given off through a chemical reaction caused by the burning of a fuel source.Full Answer >
Argon gas is an element found on the periodic table in the noble gas group. It is element number 18, and it has an atomic mass of 40 grams per mole.Full Answer >