Both the trunk and the backseat of a car can become hot under certain conditions, but typically, the trunk tends to get hotter than the backseat. The trunk is usually an enclosed space with limited ventilation, which can cause heat to accumulate more rapidly. Additionally, the trunk is often directly exposed to the heat generated by the car's engine, especially in older vehicle models where the engine is located at the front.
On the other hand, the backseat is relatively more open and connected to the cabin of the car, allowing some airflow from the car's air conditioning system or outside air to circulate. This can help moderate the temperature slightly compared to the trunk. However, if the car is parked in direct sunlight or in extremely hot conditions, both the trunk and the backseat can become dangerously hot, posing a risk to any living beings or perishable items inside.
It's crucial to note that leaving anyone, including pets or children, unattended in a vehicle can be extremely dangerous, regardless of whether they are in the trunk or the backseat. High temperatures inside a vehicle can lead to heatstroke, organ damage, or even death. Always prioritize the safety and well-being of living beings and never leave them alone in a hot car.