There are roughly 15 pounds of nitrous oxide in a mother bottle. This will vary depending on the size and brand of the bottle.
A standard “mother” bottle of nitrous oxide contains between 4-6 pounds of gas. This amount will vary depending on the brand and size of the bottle.
How To Fill Nitrous At Home ! SAVE MONEY ON REFILLS! *With and without pump*
How Much Does a Nitrous Bottle Weigh
A nitrous oxide bottle, also called a nitrous tank, is used to store compressed nitrous oxide. Nitrous oxide is a colorless, odorless gas that is used in various applications, including as an oxidizer in rocket fuel and as a dental anesthetic. A typical nitrous oxide bottle has a capacity of 16 ounces (0.47 liters) and weighs about 2 pounds (0.91 kg).

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How Many Pounds are in a Bottle of Nitrous?
A bottle of nitrous typically contains between 4-6 pounds of gas.
How Long Will a 10 Lb Bottle of Nitrous Last?
Assuming you are using a 10 lb bottle of nitrous oxide (N2O) for laughing gas, it will last approximately 60-90 minutes. The average person uses about 15-20% of the gas per minute.
How Much Does a Full Nos Bottle Weigh?
A full NOS bottle weighs approximately 9-10 pounds. The weight can vary depending on the size and shape of the bottle.
How Big is a 10 Pound Nitrous Bottle?
A 10 pound nitrous bottle is typically about 17 inches tall and 9 inches in diameter. The average weight of a full 10 pound nitrous bottle is approximately 22 pounds.
Conclusion
If you are planning on using nitrous oxide for your car, it is important to know how much is in a mother bottle. This will help you determine how long you can use the nitrous before needing to refill. According to most estimates, there are about 15-20 pounds of nitrous in a mother bottle.