{\displaystyle {\frac {\partial u}{\partial t}}+(u\nabla )u=-\nabla P+\nu \nabla ^{2}u.} See also
Notes
References
External links
Introduction to Fluid Statics and Dynamics on Project PHYSNET
Pressure being a scalar quantity
wikiUnits.org - Convert units of pressure
The facilitation of eruption of the second permanent molars to the space of the first permanent molar removes the burden of continuous restorative treatment.A favourable occlusion may be acquired following a well-planned treatment and this eliminates the need for fixed orthodontic appliances therapy. However, a comprehensive discussion of the possible need of orthodontic sequelae and treatment is important.Favorable eruption position of the second permanent molar may result if the first permanent molar is extracted when the child is at the age of between 8–10 years old. This is when the crown formation of the second permanent molar is complete and the mineralization of the bifurcation is commenced.Extraction of first permanent molars before 8 years old increases the chances of the unerupted second permanent premolar drifting distally. Extraction after the age of 10 years reduces the likelihood of the mesial movement of the second permanent molar in to the first permanent molar space and may result in tilting of the second permanent molar. Epidemiology
Since first recognised in the late 1970s, the condition has puzzled many people. It is thought to be a unique defect unlike other enamel disturbances e.g. fluorosis or amelogenesis imperfecta.Many prevalence studies have now been published from findings across the globe. However, there is a large amount of variation across the results of these studies. It is reported that the prevalence of MIH ranges from 3.6% to 40.2%  with an estimate of 14.2% of the global population suffering.