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2. Compression ratio - Wikipedia

   en.wikipedia.org/wiki/Compression_ratio

   The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the static compression ratio, calculated based on the volume of the cylinder when the piston is at the bottom of ...

3. Boyle's law - Wikipedia

   en.wikipedia.org/wiki/Boyle's_law

   Here P 1 and V 1 represent the original pressure and volume, respectively, and P 2 and V 2 represent the second pressure and volume. Boyle's law, Charles's law, and Gay-Lussac's law form the combined gas law. The three gas laws in combination with Avogadro's law can be generalized by the ideal gas law.

4. Square–cube law - Wikipedia

   en.wikipedia.org/wiki/Square–cube_law

   Its volume would be multiplied by the cube of 2 and become 8 m 3. The original cube (1 m sides) has a surface area to volume ratio of 6:1. The larger (2 m sides) cube has a surface area to volume ratio of (24/8) 3:1. As the dimensions increase, the volume will continue to grow faster than the surface area. Thus the square–cube law.

5. Pilling–Bedworth ratio - Wikipedia

   en.wikipedia.org/wiki/Pilling–Bedworth_ratio

   Pilling–Bedworth ratio. In corrosion of metals, the Pilling–Bedworth ratio ( P–B ratio) is the ratio of the volume of the elementary cell of a metal oxide to the volume of the elementary cell of the corresponding metal (from which the oxide is created). On the basis of the P–B ratio, it can be judged whether the metal is likely to ...

6. Surface-area-to-volume ratio - Wikipedia

   en.wikipedia.org/wiki/Surface-area-to-volume_ratio

   The surface-area-to-volume ratio has physical dimension inverse length (L −1) and is therefore expressed in units of inverse metre (m -1) or its prefixed unit multiples and submultiples. As an example, a cube with sides of length 1 cm will have a surface area of 6 cm 2 and a volume of 1 cm 3. The surface to volume ratio for this cube is thus.

7. Tetrahedron - Wikipedia

   en.wikipedia.org/wiki/Tetrahedron

   self-dual. Net. 3D model of a regular tetrahedron. In geometry, a tetrahedron ( pl.: tetrahedra or tetrahedrons ), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices. The tetrahedron is the simplest of all the ordinary convex polyhedra.