Core Points - High temperatures in summer can cause car interiors to reach extreme temperatures, often exceeding 70℃, creating hazardous conditions for various items inside the vehicle [1][3] - Incidents of items like cleaning sprays and aromatherapy products exploding in parked cars due to heat have been reported, highlighting the risks associated with leaving such items in vehicles [1][2] - The phenomenon of "lens effect" from certain items, such as bottled water and sunglasses, can lead to ignition and fire hazards within the car [2][4] Group 1 - High temperatures can cause car interiors to become like "mobile ovens," with dashboard temperatures exceeding 80℃ under direct sunlight [3][4] - Items such as lighters and power banks can explode or catch fire when left in hot vehicles, with tests showing significant temperature increases leading to combustion [4][6] - The use of aerosol sprays in cars poses a significant risk, as they can explode when exposed to high temperatures, leading to dangerous situations [5][6] Group 2 - Fire incidents have occurred due to the "convex lens effect" of items like bottled water, which can concentrate sunlight and ignite surrounding materials [2][4] - Recommendations for safely managing vehicle temperatures include using sunshades and ventilating the car before entering, which can lower the internal temperature by 5 to 10℃ [7][8] - Firefighters suggest techniques for quickly cooling down a car after it has been parked in the sun, such as opening windows and using air conditioning effectively [7][8]

Core Points - The article highlights the risk of fire caused by glass objects under sunlight, comparing them to "small grenades" due to their potential to ignite surrounding materials [1][4] - A recent incident in Beijing's Huairou district involved a storage compartment catching fire due to improperly stored glass and paper materials, demonstrating the dangers of mixed storage [3][4] - The phenomenon is explained through the lens of the magnifying effect, where sunlight can be focused by glass objects, leading to ignition of flammable materials [6][11] Summary by Sections - **Incident Description** - A fire occurred on June 4 at a street shop's storage compartment, which was quickly addressed by firefighters [1][2] - The compartment contained only cardboard and miscellaneous items, with no active production or electrical wiring present [3] - **Cause of Fire** - The investigation revealed that the storage was overcrowded with mixed items, including empty glass bottles and paper products, which contributed to the fire risk [3][4] - Sunlight entering through gaps in the locked compartment door focused through glass items, igniting nearby combustible materials [4][6] - **Similar Cases** - Other incidents were cited, such as a fire caused by a double-sided mirror reflecting sunlight onto a table, and another involving crystal balls igniting cardboard in a backyard [6][9][7] - **Fire Prevention Tips** - Recommendations include avoiding placing glass objects in direct sunlight and keeping them away from flammable materials [13] - Emphasis on educating children about the dangers of using magnifying glasses and similar items [13]