Why Is It So Hard to Get the Last Bit of Shampoo Out?
You press the pump again and again. Nothing comes out. But when you shake the bottle, you can clearly hear that there is still shampoo inside. So why does the last bit of shampoo refuse to come out? It is not simply because the bottle is almost empty. The real reason involves the shampoo’s thickness, the shape of the container, and the limits of the pump itself. The Hidden Problem Inside a Shampoo Bottle Most of us have experienced the same frustrating moment. There is clearly some shampoo left, but the pump no longer works. We turn the bottle upside down, tap the bottom, remove the pump, or even add a little water. This happens because several small design and material factors begin working against us when the bottle is nearly empty. 1. Shampoo Is Designed to Be Thick Shampoo is not supposed to flow like water. If it were too thin, it would run through your fingers, drip before reaching your hair, and become difficult to control. To make shampoo easier to apply, manufacturers give it ...