Why Do Soda Cans Explode in the Fridge?

Opening the fridge with anticipation, you reach for a refreshing can of soda, only to be met with an explosive surprise. The once calm and quenching beverage has turned into a fizzing mess, leaving behind a sticky residue and a burst can. This occurrence, while frustrating, has a scientific explanation. In this article, we will explore the reasons behind soda cans exploding in the fridge and provide practical solutions to prevent such mishaps.

Understanding the Science of Carbonation

Before delving into the reasons why soda cans explode in the fridge, it is essential to grasp the underlying science of carbonation. Carbonated beverages, such as soda, are infused with carbon dioxide (CO2) gas. This gas is dissolved under high pressure during the manufacturing process, which creates the characteristic fizziness we associate with sodas.

When the can is sealed, the CO2 remains in the liquid due to the pressure inside the can. As a result, the beverage remains carbonated until it is opened. Once the can is opened, the pressure is released, causing the CO2 to escape in the form of bubbles, giving the soda its signature effervescence.

Temperature and Pressure Relationship

Temperature plays a crucial role in the carbonation process and can impact the stability of a sealed soda can. According to the ideal gas law, there is a direct relationship between temperature and pressure: as temperature increases, so does pressure, and vice versa. This concept is vital in understanding why soda cans explode in the fridge.

Freezing Point of Carbonated Beverages

One of the critical factors contributing to soda can explosions is the freezing point of carbonated beverages. Water freezes at 0°C (32°F), but the freezing point of carbonated beverages is lower due to the dissolved CO2 gas. The presence of CO2 lowers the freezing point, allowing the beverage to remain in a liquid state even at lower temperatures.

However, as the temperature decreases, the solubility of CO2 in the liquid decreases as well. Consequently, excess CO2 gas may be released, leading to an increase in pressure within the can. When the pressure becomes too high for the can to contain, it results in an explosive release of the built-up gas and liquid.

Factors Contributing to Soda Can Explosions

Several factors contribute to the occurrence of soda can explosions in the fridge. Understanding these factors can help in preventing such mishaps.

  1. Low Temperature: Placing a soda can in the fridge at very low temperatures can cause the liquid inside to freeze partially or fully. This freezing can lead to the expansion of liquid and gas, creating excessive pressure within the can, ultimately causing it to explode.
  • Physical Damage: A damaged or compromised can, even a minor dent or crack, can weaken the structure and integrity of the can. Weakened cans are more likely to explode under increased pressure.
  • Agitation: Shaking or excessive movement of the soda can causes the CO2 gas to become more active, resulting in higher pressure buildup within the can. If this pressurized can is then subjected to low temperatures, the chances of an explosion are significantly increased.
  • High Carbonation Levels: Sodas with higher levels of carbonation are more prone to exploding in the fridge. The increased concentration of CO2 gas dissolved in the liquid intensifies the pressure within the can.
  • Altitude Changes: Rapid changes in altitude, such as when transporting sodas from a lower elevation to a higher one, can affect the internal pressure of the cans. The decreased external pressure at higher altitudes can cause the cans to expand, leading to potential explosions.

How to Prevent Soda Can Explosions

To avoid the inconvenience and mess of soda can explosions in the fridge, here are some practical solutions:

  1. Gradual Cooling: Instead of placing a warm soda can directly in the fridge, allow it to cool gradually at room temperature before refrigeration. This helps in avoiding rapid temperature changes and reducing the chances of soda can explosions.
  • Optimal Fridge Temperature: Ensure that the temperature of your fridge is set to an optimal level, typically between 35°F to 40°F (1.7°C to 4.4°C). This range maintains the beverages at a cool temperature without reaching freezing conditions.
  • Handling with Care: Treat soda cans gently and avoid any physical damage, such as dents or cracks. Damaged cans are more likely to rupture under pressure.
  • Avoid Agitation: Refrain from shaking or excessively moving soda cans, especially when they are already chilled. This will minimize the activation of CO2 gas and lower the chances of pressure buildup.
  • Release Pressure: Before placing a soda can in the fridge, consider releasing some pressure by gently tapping the top of the can or opening it slightly and resealing it. This allows excess CO2 to escape, reducing the risk of explosion.


The phenomenon of soda cans exploding in the fridge can be attributed to the relationship between temperature, pressure, and the carbonation process. Understanding the science behind carbonation and the factors contributing to soda can explosions will enable you to take preventative measures. Simply follow the practical solutions mentioned above to minimize the likelihood of encountering an explosive surprise when reaching for a cold, refreshing soda from your fridge. Stay safe and enjoy your fizzy beverages responsibly!

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