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Will Alcohol Left in a Car Spontaneously Combust in Summer?

3 Answers

StAshlyn

07/29/25 8:56pm

Leaving alcohol in a car during summer can lead to spontaneous combustion, which is extremely dangerous. Here are relevant details about alcohol: 1. Ignition Point: Medical alcohol with a concentration of 75% has an ignition point of 20 degrees Celsius. During summer, outdoor temperatures at noon can exceed 40 degrees Celsius, and if a car is parked outdoors under direct sunlight, the interior temperature can reach over 50 degrees Celsius, making it highly susceptible to spontaneous combustion and explosion of alcohol. Alcohol left in a car under direct sunlight can explode. 2. Risk of Explosion: Alcohol is a flammable and explosive substance. In a sealed car compartment exposed to sunlight, temperatures can soar to 50-60 degrees Celsius. Without air circulation, encountering an open flame or flammable materials (such as a lit cigarette) can trigger an explosion. If stored in a glass container, sunlight can create a magnifying glass effect, focusing light and igniting the alcohol, which is highly likely to cause an explosion.

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AylaRose

08/15/25 6:42pm

Keeping alcohol in the car during summer does pose a spontaneous combustion risk, so we need to be extra careful with what we store inside. In summer, car temperatures can easily soar above 60°C, and alcohol is highly volatile. If the bottle cap isn't tightened properly, alcohol vapor can fill the car. At higher concentrations, even the tiniest static spark can ignite it. Last summer, someone in our neighborhood left medical alcohol in the trunk, and when they pressed a lighter while opening the car door, it went 'boom' and caught fire, burning a large part of the back seat. It's safer to keep items like floral water in the car instead.

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ZaneAnn

10/16/25 7:25am

From a scientific perspective, the possibility of alcohol self-igniting in a car is not negligible. According to my research, the ignition point of alcohol is approximately 21°C, while the dashboard area in a sealed car cabin can easily exceed 60°C during summer. If the alcohol bottle is of poor quality, direct sunlight increases internal pressure, making it prone to deformation and gas leakage. When alcohol vapor accumulates in the air reaching the 5% concentration threshold, encountering static electricity or sparks from car electronics becomes extremely hazardous. Previous lab tests showed that an open alcohol bottle placed in a high-temperature environment can create a flammable atmosphere within just 30 minutes.

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