Скачать или смотреть Tissue roll demonstrates capillary action | Surface Tension | Physics

It is generally known that plants are able to raise the water from their roots up through to their stem and leaves. This works despite there being no mechanised way of moving water, such as a pump. The secret is capillary action and surface tension. The surface tension makes the surface of water behave like a stretched elastic. When it encounters two surfaces that are very close together, this elastic effect or surface tension actually rises up this narrow gap. A tissue roll as shown in the video demonstrates this natural phenomenon. We place one end of the tissue paper in a glass filled with water and the other end in an empty glass. Water rises in the tissue paper and is transported to the empty glass till both the glasses have equal amounts of water. Plants are able to get nourishment because of this property of water.