Spontaneous example sentences

These and many other spontaneously occurring changes show unidirectional change.But heat will not flow from colder body to warmer body on its own, the gas in a container will not spontaneously contract into one corner or carbon dioxide will not form carbon and dioxygen spontaneously.Another aspect of spontaneous reaction or process, as we see is that these cannot reverse their direction on their own.They move less spontaneously or make odd grimaces and gestures.They are unofficial, spontaneous, unrecorded, spread very fast and usually distorted.We can say that entropy for a spontaneous process increases till it reaches maximum and at equilibrium the change in entropy is zero.In fact, all naturally occurring processes whether chemical or physical will tend to proceed spontaneously in one direction only.Yet, we need to understand why such a tendency appears to be natural or spontaneous.If it is not, the system would spontaneously change to configureuration of lower free energy.In pregnant women who have the habit of smoking the increased CO level in blood may induce premature birth, spontaneous abortions and deformed babies.By analogy, we may be tempted to state that a chemical reaction is spontaneous in a given direction, because decrease in energy has taken place, as in the case of exothermic reactions.Let us first understand what do we mean by spontaneous reaction or change ? You may think by your common observation that spontaneous reaction is one which occurs immediately when contact is made between the reactants.We may ask 'what is the driving force of spontaneously occurring changes ? What determines the direction of a spontaneous change ? In this section, we shall establish some criterion for these processes whether these will take place or not.Then, what drives the spontaneous process in a given direction ? Let us examine such a case in which ?H = 0 i.e., there is no change in enthalpy, but still the process is spontaneous.We may summarise it as follows: A spontaneous process is an irreversible process and may only be reversed by some external agency.