Tritium key chains are banned in the US as a "frivolous" use of tritium, but you can legally buy location markers and such like provided you certify that they will be permanently affixed in a stationary location, which is registered with the government. Tritium is also used as a tracer in certain biochemical reactions, because it can stand in for hydrogen, which is in everything, and you can determine where even vanishingly small quantities of it are by measuring the radioactivity. This particular item is a "location marker" used typically in military situations on ships to make visible the location of obstacles, etc. Tritium has two main uses: Thermonuclear weapons and glow in the dark key chains, buttons and exit signs. Tritium is radioactive, while deuterium and hydrogen are not. Deuterium (see below) is hydrogen with only one extra neutron. That is, the nucleus is one proton and two neutrons instead of just a plain proton like normal hydrogen. Tritium is hydrogen with two extra neutrons.
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Making hydrogen gas is actually very easy, and you can read all about how to do it by clicking the story book icon for this sample. (Sorry Martha, I did not use flavored sea-salt.) This is a very Martha Stewart sample: I made it from scratch with two batteries, two paper clips, and a cup of salt water. Compared to digging up carbon and burning it into carbon dioxide, the environmental impact would be just about nothing. The net effect of the whole enterprise would be to transport an insignificant amount of water from the oceans to the cities. This makes it very attractive as a clean-burning fuel: It's hard to imagine a more friendly energy economy than one based on using solar energy to split water into hydrogen and oxygen, storing the hydrogen, then burning it back into water in cars, fuel cells, etc. When you burn hydrogen in air, the combustion product is plain water: This tempted people to use it for balloons and blimps until the well known Hindenburg disaster, which illustrated that, as a gas, hydrogen is rather flammable. Because the density of a gas (at a given temperature and pressure) depends mostly on the atomic weight of the atoms or molecules in it, hydrogen is the lightest gas of all. Along with carbon and oxygen, it is one of the fundamental building blocks out of which all living things are built. About 90% of all the matter in the universe is hydrogen.
Hydrogen is the first, the simplest, the lightest, and the most common element by far. My periodic table poster is now available! Facts, pictures, stories about the element Hydrogen in the Periodic Table