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2. Packing problems - Wikipedia

   en.wikipedia.org/wiki/Packing_problems

   Packing problems are a class of optimization problems in mathematics that involve attempting to pack objects together into containers. The goal is to either pack a single container as densely as possible or pack all objects using as few containers as possible. Many of these problems can be related to real-life packaging, storage and ...

3. Cubic crystal system - Wikipedia

   en.wikipedia.org/wiki/Cubic_crystal_system

   A network model of a primitive cubic system. The primitive and cubic close-packed (also known as face-centered cubic) unit cells. In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.

4. International System of Units - Wikipedia

   en.wikipedia.org/wiki/International_System_of_Units

   The systems formalised the concept of a collection of related units called a coherent system of units. In a coherent system, base units combine to define derived units without extra factors. [4]: 2 For example, using meters per second is coherent in a system that uses meter for length and seconds for time, but kilometre per hour is not coherent.

5. Litre - Wikipedia

   en.wikipedia.org/wiki/Litre

   A litre is a cubic decimetre, which is the volume of a cube 10 centimetres × 10 centimetres × 10 centimetres (1 L ≡ 1 dm 3 ≡ 1000 cm 3). Hence 1 L ≡ 0.001 m 3 ≡ 1000 cm 3; and 1 m 3 (i.e. a cubic metre, which is the SI unit for volume) is exactly 1000 L. From 1901 to 1964, the litre was defined as the volume of one kilogram of pure ...

6. Sphere packing - Wikipedia

   en.wikipedia.org/wiki/Sphere_packing

   Sphere packing finds practical application in the stacking of cannonballs. In geometry, a sphere packing is an arrangement of non-overlapping spheres within a containing space. The spheres considered are usually all of identical size, and the space is usually three- dimensional Euclidean space. However, sphere packing problems can be ...

7. Close-packing of equal spheres - Wikipedia

   en.wikipedia.org/wiki/Close-packing_of_equal_spheres

   Contents. Close-packing of equal spheres. Illustration of the close-packing of equal spheres in both HCP (left) and FCC (right) lattices. In geometry, close-packing of equal spheres is a dense arrangement of congruent spheres in an infinite, regular arrangement (or lattice). Carl Friedrich Gauss proved that the highest average density – that ...