It is denoted by the symbol m2 (33A1 in Unicode). It is defined as the area of a square whose sides are one metre long. A square with dimensions of 2 metres long and 2 metres wide, for example, has a surface area of 4 square metres. 4m2 is equivalent to 2m x 2m. A square of 4 metres squared, on the other hand, would have 4 metres on each side. Meters per second per second is a measure of the rate of flow of water through a pipe. It is usually expressed as millimeters or inches per hour. 1 meter per second is equal to 1 m/s. 1000 meters per minute is equal to 100 m/s. 100 meters per second is called a "fast" speed while 0 meters per second is called a "stop" speed. 2 square meters is less than a square yard which has an area of 4 square feet. Square meters are used mostly when talking about areas of floor space. For example, an office room that is 10 meters by 10 meters has a surface area of 200 square meters. The term "square meter" cannot be used alone to describe a piece of furniture because there are several types of shapes for rooms, such as squares, rectangles, and circles. Decibels (dB) are a way to describe the strength of something loud. Sound pressure levels (SPL) are measured in decibels (dB), and they indicate the sound pressure waves' intensity at 1 meter from the source.