Definition - What does Positive Displacement Pump mean? Positive Displacement Pump is a type of pump used to displace or force oil and petroleum products into pipelines or into various equipment installed in refineries.
A brain looks like a walnut because our minds are constantly making comparisons and finding similarities to help us understand the world around us. Here's an activity that can help you see more such things. Try to find faces.
All dried leaves should be packed away at once, in airtight, wooden or tin boxes in a dry place, otherwise they re-absorb moisture from the air. Walnut leaves are parchment-like when dry, and the leaf-stalks brown, but the leaves themselves keep their good colour when dried. They have a bitter and astringent taste. By long keeping, the leaves become brown and lose their characteristic, aromatic odour. The bark is dried in the same manner as the leaves.