Chemistry is study of physical and chemical properties of elements and compounds. While studying the same, various observations are made and inference derived from it. As such it involves discovery of correlations. Correlations means dependency. Dependency may be direct or inverse.
Establishing the dependencies scientifically is very important as this can be converted to standard laws. These standard laws are useful in study of chemistry and chemical calculations
Direct Dependencies
Direct dependency means a parameter changes as the another changes. If one increases the another too increases.
e.g. An observation is made that the volume of a gas increases as the temperature increases. How can this direct dependendeny be presented mathematically?
V `alpha ` T
This equation is further rationalised as
V = k T
where k is the constant for the corelation
OR
V / T =Constant
This is the established equation for Charles' Law
The direct dependencies may be proportional to 1st or 2nd or 3rd or even 1/2 or 1/4 etc. power too.
As in case of famous Einstein equation
E= mc2
lt denotes that the energy released is directly proportional not to the speed of light but, to the square of the speed of light
Inverse Dependencies
Inverse dependency means a parameter changes as the another changes.If one increases the another decreases.
e.g. An observation is made that the volume of a gas increases as the temperature decreases. How can this inverse dependendeny be presented mathematically?
V `alpha ` 1/P
This equation is further rationalised as
V =k / P
where k is the constant
for the corelation between volume and pressure..
or PV=Constant
This is the established equation for Boyles' Law
The inverse dependencies may be proportional to 1st or 2nd or 3rd or even 1/2 or 1/4 etc. power too
