Helium has the lowest boiling point of all elements—4.2 degrees Kelvin (that -268.8 Celsius)—just 4 degrees above absolute zero. Helium is the only element that cannot be solidified by sufficient cooling at normal atmospheric pressure. Helium was the first element not to be discovered on earth.

An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Different isotopes of the same element cannot have the same mass number, but isotopes of different elements often do have the same mass number, e.g., carbon-14 (6 protons and 8 neutrons) and nitrogen-14 (7 protons and 7 neutrons).

Isotopes are atoms that have the same atomic number but different mass numbers due to a change in the number of neutrons. While the presence of isotopes affects the mass of an atom, it does not affect its chemical reactivity. Chemical behavior is governed by the number of electrons and the number of protons.

Short answer: it would weigh more when full if it’s a pressurized tank. This is because density increases with pressure. Helium, at room temperature and atmospheric pressure, is much less dense than air. This causes things (like balloons) containing helium to appear to decrease in weight, due to buoyancy.

Helium, on the other hand, is much lighter than air (nitrogen and oxygen), so that is why a helium-filled balloon goes up. At higher altitudes, the air is thinner (less atoms in the same volume), but the relative amounts of nitrogen and oxygen are the same.

Safe storage and transportation of balloons filled with a hydrogen-oxygen mixture is a very risky undertaking. Yet if the floor in the demonstration area were carpeted, enough static could be generated to ignite a balloon.

Our surrounding is filled with air. Now it is known that the density of hydrogen and helium is lighter than that of air. So, if a balloon is filled with any of these gases, the balloon will float. Since we are talking about floating balloons without helium, we would consider Hydrogen gas here to fill the balloon.

Argon can be used instead of Helium and is preferred for certain types of metal. Helium is used for lots of lighter than air applications and Hydrogen is a suitable replacement for many where the flammable nature of Hydrogen is not an issue.

Balloons are a staple of every party, but procuring a helium tank can sometimes be tricky.

1. It turns out, there’s a lot you can do with balloons, even without helium.
2. If you want to add a pop of color to your party or create a backdrop for your dessert table, a balloon garland (or arch) is the way to go.

You need a gas that is lighter than air to float the balloon, which is why we use helium. Helium is the result of the very long, very slow decay of radioactive atoms like uranium. Currently, this natural process is the only method with which helium is produced on Earth. In other words: You cannot make your own helium!

Buy a bag of balloons and fill them easily at party supply stores or the floral department of your local grocery store. Alternately, you can purchase and fill balloons at a Dollar Tree or 99 Cents Only Store near you. One of these options is bound to be around the corner.

CVS inflates balloons (helium).