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What is ‘Science’? Science is induction. If we are given the input, output, and the system and we then discover or demonstrate the natural laws governing the system, it is called Science. For example: Let the system be an automobile engine. The inputs are initial temperature, pressure and the calorific value of fuel. The outputs are the final temperature, pressure and the power generated by the engine. Then the laws governing the engine are the ‘Thermodynamic Laws’, which are discovered by the Scientists.
What is ‘Engineering’? Engineering is induction as well as deduction i.e. discovering the engineering or scientific laws and creating the system such as an engine. It is called ‘Engineering.
What is ‘Technology’? It is the application of ‘Science & Engineering’ on a large scale. For example, when Faraday (a Scientist/Engineer), for the first time in history, rotated a copper wire within two magnets (producing the magnetic lines of force), he found that electricity was generated with which an electric bulb started to glow. The glowing of bulb was an important engineering discovery, and the Law governing it was called as ‘The Law of Electricity’ or ‘Faraday’s Law of Electricity’ This is ‘Science & Engineering’. When this Law is applied on a large scale, such as producing electricity of great power through a big electric generator, it is called ‘Technology.
A scientist discovers the natural laws.
An engineer creates a machine or an engineering system.