"The proton–proton chain reaction is one of several fusion reactions by which stars convert hydrogen to helium, the primary alternative being the CNO cycle. The proton–proton chain dominates in stars the size of the Sun or smaller.
In general, proton–proton fusion can occur only if the temperature (i.e. kinetic energy) of the protons is high enough to overcome their mutual electrostatic or Coulomb repulsion.
In the Sun, deuterium-producing events are so rare (diprotons, the much more common result of nuclear reactions within the star, immediately decay back into two protons) that a complete conversion of the star's hydrogen would take more than 1010 (ten billion) years at the prevailing conditions of its core. The fact that the Sun is still shining is due to the slow nature of this reaction; if it went more quickly, the Sun would have exhausted its hydrogen long ago." [Proton–proton chain reaction. Wikipedia]
The nuclear reaction diagram example "Proton-proton chain reaction" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Physics solution from the Science and Education area of ConceptDraw Solution Park.
In general, proton–proton fusion can occur only if the temperature (i.e. kinetic energy) of the protons is high enough to overcome their mutual electrostatic or Coulomb repulsion.
In the Sun, deuterium-producing events are so rare (diprotons, the much more common result of nuclear reactions within the star, immediately decay back into two protons) that a complete conversion of the star's hydrogen would take more than 1010 (ten billion) years at the prevailing conditions of its core. The fact that the Sun is still shining is due to the slow nature of this reaction; if it went more quickly, the Sun would have exhausted its hydrogen long ago." [Proton–proton chain reaction. Wikipedia]
The nuclear reaction diagram example "Proton-proton chain reaction" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Physics solution from the Science and Education area of ConceptDraw Solution Park.
Physics
Physics solution extends ConceptDraw PRO software with templates, samples and libraries of vector stencils for drawing the physical illustrations, diagrams and charts.
Physics Symbols
ConceptDraw PRO diagramming and vector drawing software extended with Physics solution from the Science and Education area is a powerful software for creating various physics diagrams.Physics solution provides all tools that you can need for physics diagrams designing. It includes 3 libraries with predesigned vector physics symbols: Optics Library, Mechanics Library and Nuclear Physics Library.
Cross-Functional Flowchart
Cross-Functional Flowchart - to draw cross functional process maps is by starting with a cross-functional flowchart samples and templates. Easy to draw sample cross functional Process Flow Diagrams. Using a Cross-Functional flowchart is a clear way of showing each team member’s responsibilities and how processes get shared or transferred between different teams and departments.Use cross-functional flowcharts to show the relationship between a business process and the functional units (such as departments) responsible for that process. To create it use the best flowchart maker of ConceptDraw PRO.
![How to Draw a Cross Functional Flowchart using visio alternative ConceptDraw PRO as visio for mac](https://i1.ytimg.com/vi/g9bRexgFibs/hqdefault.jpg)
Chemistry
This solution extends ConceptDraw PRO software with samples, template and libraries of vector stencils for drawing the Chemistry Illustrations for science and education.
Biology
Biology solution extends ConceptDraw PRO software with samples, templates and libraries containing biological vector symbols, to help you create scientific and educational designs in the field of biology.
Network Community Structure. Computer and Network Examples
Network community structure is a network which nodes can be easily grouped into the sets of nodes with dense internally connections.This example shows a network that displays the community structure with three groups of nodes with dense internal connections and sparser connections between the groups.
![](https://i1.ytimg.com/vi/h62-9iTdQp0/hqdefault.jpg)
Venn Diagrams
Venn Diagrams are actively used to illustrate simple set relationships in set theory and probability theory, logic and statistics, mathematics and computer science, linguistics, sociology, and marketing. Venn Diagrams are also often used to visually summarize the status and future viability of a project.
Biology Drawing Software
Biology is incredibly interesting and useful natural science which studies all living things on the earth (people, animals, plants), structure, functions, interactions, evolution of living organisms. Biologists of the whole world use actively illustrations and drawings in your science and education activity. To facilitate their task of biology drawing, ConceptDraw PRO diagramming and vector drawing software was extended with Biology solution from the Science and Education area. Now, ConceptDraw PRO is a powerful biology drawing software.- Proton-proton chain reaction diagram
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