In a chilling reminder that a common summer shortcut can turn lethal, a woman in Guangdong, China, suffered severe throat injuries this month when a frozen bottle of cola exploded in her face. Ms. Li, a resident of Maoming, had placed a carbonated drink in the freezer for rapid chilling—a practice millions adopt on hot days. When she bit the cap to dislodge ice blocking the opening, the bottle burst, sending shards of frozen liquid and pressurized gas into her mouth and throat. She was rushed to hospital with lacerations, bleeding, and stomach pain.
The Physics Behind the Blast
Taiwanese physician Dr. Liao Kuanyung has explained the science behind the incident, which is far from an urban legend. Carbonated beverages like cola, soda water, and sparkling drinks contain dissolved carbon dioxide (CO₂) under pressure inside the bottle. When the liquid freezes, water expands by roughly 9% in volume. In a sealed container, this expansion—combined with the compressed CO₂—creates a massive spike in internal pressure.
“It’s not about soda spraying everywhere,” Dr. Liao noted in a social media post. “The real danger is that the pressure can cause the bottle to deform, crack, or launch the cap like a bullet at high speed.” The result can be devastating eye, face, or hand injuries. Past cases include a six-year-old boy who needed 38 stitches to his face after forcing open a frozen cola bottle.
Two Types of Drinks That Should Never Go in the Freezer
According to Dr. Liao and mainland Chinese fire safety authorities, two categories of beverages are particularly hazardous when subjected to subzero temperatures:
- All carbonated soft drinks: Cola, Sprite, tonic water, sparkling water, and any drink with added CO₂.
- Beer and sparkling wine: These also contain dissolved gas and can explode similarly.
Alcoholic beverages without carbonation (e.g., still wine, spirits) and non-carbonated juices are generally safe to freeze, though ice expansion can still crack glass bottles.
Safety Tips for Thirsty Summer Days
To avoid turning a refreshing drink into a projectile, experts offer these actionable guidelines:
- Never freeze carbonated drinks. Keep them in the refrigerator compartment (above 0°C), not the freezer.
- Avoid high-temperature environments. Do not leave soda in a car parked in direct sunlight; heat can also cause pressure buildup and explosions.
- Inspect the bottle. If the container appears swollen, deformed, or damaged, do not open it near your face. Open it at arm’s length or discard it safely.
- Thaw frozen soda naturally. If a carbonated drink has already frozen solid, let it sit at room temperature until fully melted. Avoid shaking, tapping, or trying to force the cap open during the process.
Why This Matters Beyond a Single Incident
The incident in Guangdong is not isolated. As summer temperatures soar across Asia, the temptation to speed-chill drinks grows. Many consumers are unaware that the fizzy beverages they love can become volatile when frozen. Social media has amplified the story, prompting warnings from health departments and fire brigades.
Dr. Liao emphasizes that awareness is the best prevention. “This isn’t about banning cola—it’s about understanding basic physics and respecting the pressure inside that bottle,” he said. The woman in Maoning is recovering, but the case serves as a stark reminder: a simple shortcut can carry life-altering consequences.
For further reading, explore articles on the chemical differences between Hong Kong and mainland cola, or how to clean burnt pots using cola—responsibly, of course.