The Sanskrit is considered most scientific language of the world because.

we all very well know that samskrit has predefined structures,i.e. of "shabda roopa" & "dhaatu roopa"...it is just as the commutativity & associativity of the simple arithmetic...and thus the very language has excellent grammar that never depends upon where a particular word should be put...it is pronounced the same way it is written in...a well ordered system of alphabets it has, strictly based on the science of vibrations produced by different sounds...moreover, this language, in itself, is a science as, if we analyse, we simply can find there a lot of symbolism used which includes and co-relates between each and every subject the mankind knows....it effortlessly covers all the aspects...

Most versatile language. A verb can be used nearly in 99 forms. A noun in nearly more than 20 forms. Very exhaustive when needed and very compact as well. Mother of many languages. Whole of ancient Indian knowledge stored in this medium.