Unknown Facts: Earlier, water reserves like wells, tanks, ponds were made under the ground, then everyone used water in their homes through this medium, but now water is being supplied to homes through pipelines. In such a situation, the higher the water tank is, the more pressure the water will reach people’s homes. Even if there is no electricity, water can be supplied. Talking about petrol, petrol evaporates as soon as it comes in contact with air. Air pressure increases with altitude. In such a situation, if the petrol tank is built on top then it can evaporate rapidly. Due to the slightest shortage in the tank, all the petrol will evaporate into the air. For this reason, despite all the difficulties, the petrol storage tank is made underground, so that the petrol remains safe and there is no disturbance in its quantity.
