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A traditional unit of volume for stone and other masonry. A perch of masonry is the volume of a stone wall one perch (16 1⁄2 feet or 5.03 metres) long, 18 inches (45.7 cm) high, and 12 inches (30.5 cm) thick. This is equivalent to exactly 24 3⁄4 cubic feet (0.92 cubic yards; 0.70 cubic metres; 700 litres).
A teaspoon is an item of cutlery, a measuring instrument, of approximately 5ml, or a unit of measurement of volume (usually abbreviated tsp.).