Helium is a non-renewable resource and once it is released into the atmosphere, it can escape into space over time. However, in practical terms, helium can last for a very long time when stored properly. When contained in sealed tanks or pressurized containers, helium can be stored for many years without significant loss. In fact, some estimates suggest that helium can be stored for up to 100 years without significant leakage. However, once released into the atmosphere, helium is lost over time and cannot be replenished. **

One can achieve a helium voice without helium by inhaling a small amount of sulfur hexafluoride gas, which is denser than air and has a similar effect on vocal cords as helium. However, it is important to note that inhaling any type of gas can be dangerous and should only be done under the supervision of a professional. Alternatively, one can use audio editing software to alter the pitch of their voice to mimic the high-pitched sound of a helium voice. **

The duration a helium tank lasts depends on the size of the tank and the rate at which the helium is being used. Typically, a small tank can last for a few hours, while a larger tank can last for several days. It is important to monitor the pressure gauge on the tank to determine how much helium is left and plan accordingly. **

Helium is generally not harmful when inhaled in small amounts, as it is an inert gas that does not react with the body. However, inhaling large amounts of helium can be dangerous as it can displace oxygen in the lungs and lead to suffocation. Inhaling helium from a pressurized tank or balloon can also cause damage to the lungs and respiratory system. Additionally, inhaling helium for the purpose of making one's voice sound high-pitched can be harmful as it can lead to lightheadedness, dizziness, and even loss of consciousness. Therefore, while small amounts of helium are generally safe, it is important to use caution and avoid inhaling it in large quantities. **

Helium is not inherently dangerous to humans in its natural state. It is non-toxic, non-flammable, and does not react with other chemicals. However, inhaling helium directly from a pressurized tank or balloon can be extremely dangerous as it can displace oxygen in the lungs and lead to suffocation. Inhaling helium in this manner can also cause dizziness, loss of consciousness, and potentially even death. Therefore, while helium itself is not dangerous, it can be hazardous if not used properly. **

No, helium is not radioactive. Helium is a noble gas and is chemically inert, meaning it does not easily react with other elements. It is stable and does not undergo radioactive decay. Helium is commonly used in balloons, airships, and as a coolant in nuclear reactors because of its non-radioactive properties. **

Helium is a non-toxic and non-reactive gas that is rapidly eliminated from the body. When inhaled, helium is exhaled from the lungs almost immediately, typically within a few breaths. It does not accumulate in the body or get metabolized, so its effects are short-lived. Helium is considered safe for use in medical procedures and is quickly eliminated from the body once inhalation stops. **

Helium atoms are the individual particles that make up the element helium. Each helium atom consists of two protons, two neutrons, and two electrons. On the other hand, the helium element refers to the pure substance composed entirely of helium atoms. The element helium is a colorless, odorless, and non-reactive gas at room temperature and is commonly used in balloons, airships, and as a coolant in various applications. **