Scuba diving

Some common gases used for scuba tanks

Among us must have seen divers using air-breathing tanks underwater. Unlike other diving methods, relying on breath or breathing under pressure from the surface of the diver usually carries a breathing air source that allows them to move more freely than the hold breath.

So do you know what gas they carry with you?

Scuba diving tanks are metal tanks that are compressed with natural outdoor air inside, not oxygen. Used to provide gas for you to breathe in the water for a safe time. There are valves for opening and closing.

Scuba Cylinder Care — O2ToGo Dive Centre

There are many other types of tank capacity available, depending on the size and pressure resistance of the tank. The volume of the bottle is measured in liters or kilograms. By compressing the air, a small bottle can hold a very large amount of air. There are 3 common sizes: 8, 10, 12 liters. In some diving cases it is necessary to combine 2 tanks to get more diving gas for longer. The pressure of the gas diving tank can withstand higher than about Mpa (320 bar). Typical pressure is 20.7, 27.6 (207 – 276 bar).

Some common breathing gases:


A mixture of oxygen, nitrogen and helium gas and is often used in deep diving in engineering and commercial diving instead of air to reduce nitrogen toxicity and to avoid the risk of oxygen poisoning.


It is a mixture of Oxygen and helium gas and is often used in very deep diving to eliminate nitrogen poisoning.


A form of trimix that is blended from helium and air without mixing with pure oxygen. It always has a ratio of 21 oxygen and 79 nitrogen. The balance of the mixture is helium.


A mixture of oxygen, helium, and hydrogen and is used to dive below 130 meters.


A mixture of hydrogen and oxygen gas, used as a breathing gas for very deep diving.

Fun Diving - Cham Island Diving Center Hoi An, Vietnam

Some common gases used for scuba tanks:


A mixture of 21% oxygen, 78% nitrogen, and about 1% other gases, mainly argon. To simplify these calculations the last 1% is usually treated as if it were nitrogen. It is the most popular diving gas. Due to its nitrogen content causes nitrogen toxicity. It was only used to dive up to 40 meters (130 feet) deep.

Pure oxygen:

Mainly used for acceleration of military, commercial or technical diving and is only safe to a depth of 6 meters (maximum operating depth). Through this depth, it is susceptible to oxygen poisoning.


A mixture of oxygen and air, and generally mixtures with more than 21% oxygen. It can be used as a tool to speed up decompression nodes in water or reduce the risk of decompression disease and thus prolong diving time.

Helium is present in most gas mixtures used in scuba tanks. Thereby, we can see the importance of helium how. In addition to gas for helium scuba diving, there are other uses and applications for other fields such as medicine, welding, cold electronics, …

Scuba diving

Scuba diving is an interesting water sport

Although it takes a lot of practice time, preparing to take a few minutes to explore the ocean, but those who love this subject think it is totally worth it.

The feeling of freedom without weight when exploring the underwater world makes many tourists excited to the sea when given the opportunity.

Joy at the bottom of the sea

Since scuba diving is an extreme sport, participants are always required to undergo training. According to the division of professional scuba divers, this sport is divided into two branches, freedive and scuba.

Freedive means that the diver doesn’t have the support of underwater breathing equipment. Freedive requires players to train hard and properly follow the instructions of the coach to improve their ability to hold their breath and withstand the pressure when going down.

Scuba diving

Equipment for a freedive diver includes: propeller, goggles, diving clothes, lead cord. The scuba is a scuba diving device, understood as an underwater breathing apparatus.

Equipping a scuba diver in addition to freedive-like items also includes a buoyancy balancing vest, breathing apparatus, and oxygen tank.

Under the clear blue water and the mysterious murmur of the sea, the fish swarm around the coral clusters with all kinds of colors and shapes that have fascinated many travelers to find a new experience on the bottom of the ocean.

Today, many brave travelers also have nightly snorkeling. At night, the diver cannot go fast and far, just sticking to the bottom of the sea, looking at the compass, shining a flashlight on any creature, watching that creature.

However, this is the time when the fish are all asleep, so they stand still for visitors to admire. The limitation of night diving is limited so visitors are easy to hit the rocks, injured.

Mental training sports

The biggest challenge in scuba diving is the depth. For the first time diving, at a depth of about 5 meters will start feeling breathless, sore ears and easily panic want to pop up.

If you fall into a state of bewilderment or fear while diving, you should stop and relax for a few seconds to calmly handle the emergency situation.

In addition to the threat of incidents, sharks, jellyfish. Many waters also have a kind of oysters that can be dangerous to the lives of divers.

Favorite water sports

7 favorite water sports that you should try at least once (Part 1)

Playing water sports is one of the most favorite recreational activities when spending time on vacation on yachts. If you like to dive, make sure you will not be able to deny diving with snorkel in the ocean, watching the coral reefs and colorful fish swimming around you.

If you are a lover of dramatic sports, water skiing or Jet Ski is the game you want to try. Let’s take a look at a list of sports that you should enjoy at least once in life.

1. Scuba diving

If you are a lover of the beauty of the ocean, and watching the underwater life most vividly, snorkeling is definitely the right sport for you. Imagine yourself as an ocean resident on a sunny morning, you jump into the warm waters of a yacht in trendy diving suits and swim with fish, admiring strange creatures that are hard to come by visible in artificial aquariums.

Back to the boat, the butler will be ready to give you a glass of sweet orange juice as soon as you step up the stairs. In addition, when choosing to watch marine animals and plants right in the ocean, you have contributed to the protection of marine flora and fauna. By reducing one person to the aquarium, there is a one percent increase in the chance for these creatures not to be entertained.

2. Jet Ski

Jet ski is an interesting sport for those who love yachts in particular and water sports in general. In particular, jet ski only fun when playing from two or more.

To save space for a flybridge-type individual yacht, you can bring a stand-up jet ki (jetski) to the pool deck 1 stern and 1 boat’s upper deck. For speed enthusiasts, driving Jet Ski is considered an exciting activity that needs to be tried at least once in a lifetime.

Sitting on a boat and surfing on the verandah in a place where only your companion, with clouds of water while the wind is playing with your hair is more interesting, safe and legal than racing on land. many times.