Why might flammable gas have been mixed with helium for balloons?

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Flammable Gas May Have Been Mixed With Helium for Balloons to Reduce Costs

The recent balloon explosion injuring 16 people at a fitness event in Putrajaya might have resulted from a mixture of gases, with flammable gas potentially added to helium. This adulteration is suspected to be a cost-saving measure. Helium, a naturally inert gas, is commonly used for balloons due to its lightness and inability to combust. However, when mixed with flammable substances, it can become hazardous, particularly when exposed to open flames.
Cost-Effectiveness of Flammable Gases

Flammable gases, such as hydrogen, are generally less expensive to produce and procure than helium. While helium is prized for its non-flammable properties, making it the safest choice for public events, its cost can be a significant factor for large-scale balloon inflation. The economic incentive to dilute helium with a cheaper, albeit flammable, gas could therefore be a driving force behind such adulteration practices, especially in contexts where budget constraints are a concern.
Properties of Helium for Ballooning

Helium is the preferred gas for inflating balloons primarily because it is inert. This means it does not react chemically with other substances, making it non-combustible and safe for use in environments where heat sources or sparks might be present. Its low density also provides excellent buoyancy, allowing balloons to float effectively. These characteristics make helium the standard for celebratory and promotional balloons, ensuring a safe and visually appealing display.
Risks of Mixing Inert and Flammable Gases

Mixing an inert gas like helium with a flammable gas introduces significant safety risks. While helium itself does not burn, the presence of a flammable component in the mixture means the entire gas could ignite if exposed to a spark or flame. This was underscored at the Putrajaya event where an attempt to cut balloon strings with a cigarette lighter is believed to have triggered the explosion. Such incidents highlight the dangers of using adulterated gases, especially in public gatherings where the presence of ignition sources cannot always be entirely controlled. The resulting burns sustained by victims, including children, demonstrate the severe consequences of this practice.

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Why might flammable gas have been mixed with helium for balloons?

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