Also known as the Pearson product-moment correlation coefficient, the correlation coefficient (r) measures the linear relationship between two variables, with a value range of -1 to 1. A value close to 1 indicates there is a strong positive linear correlation between two variables; that is, when one variable increases so does the other.
A short definition. Delta H of a reaction is the enthalpy of reaction. H of products minus H of reactants. Each compound has a delta H of formation (dHf). The heats of formation for each substance in a reaction can be added together to compute the energy change for a reaction.
What Does Delta Mean? Uppercase delta has two different mathematical meanings. Both meanings begin with the letter D just like the Greek letter, which should help you remember them: Difference is the most common meaning of the uppercase delta. It is simply the difference, or change, in a certain quantity. When we say delta y, for example, we mean the change in y or how much y changes. Discriminant is the second most common meaning of the uppercase delta. The discriminant is found in the quadratic formula and determines the number of solutions a particular quadratic equation has. The lowercase delta is seen more often in calculus.