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.Continue Reading
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
Water is a liquid at room temperature because the hydrogen bonds within its construction are weak. These weak bonds hold water molecules together for mere milliseconds, which keeps water in a constantly liquid state at room temperature.Full Answer >
Water is composed of two atoms of hydrogen and one atom of oxygen. Because of this composition, water has unique properties that has made it essential to life on the planet.Full Answer >
Examples of gases include oxygen, nitrogen, helium, hydrogen, argon, fluorine, krypton, neon, radon, xenon and chlorine. These gases are single elements, though many gases are compounds or mixtures. Such gases include carbon dioxide, carbon monoxide, methane, air, ammonia, formaldehyde, ozone, nitrous oxide and natural gas.Full Answer >
Water freezing into ice is a physical change because the hydrogen and oxygen molecules that make up the water stay the same, despite the change in state from liquid to solid. A physical change is simply a change in the material's physical properties, such as shape or phase.Full Answer >