Anotherreport estimates that, given the high costs associated withchildhood ETS exposure, reducing parental smoking by15% could save $1 billion in direct medical costs at theprenatal and neonatal levels and into childhood.The authorsâ survey of interventions and theireffectiveness in this area is encouraging.
adjective. noun. The definition of normal is regular, natural or staying with the general standard. An example of normal is a human temperature of 98.6. Normal is defined as the usual or the average. An example of normal is the general amount of goods that a company makes each year.
In the three-dimensional case a surface normal, or simply normal, to a surface at a point P is a vector that is perpendicular to the tangent plane to that surface at P. The word normal is also used as an adjective: a line normal to a plane, the normal component of a force, the normal vector, etc. That is, any vector orthogonal to all in-plane vectors is by definition a surface normal. If a (possibly non-flat) surface S is parameterized by a system of curvilinear coordinates x (s, t), with s and t real variables, then a normal is given by the cross product of the partial derivatives.