1. The action of producing, bringing forth, making, or causing; the fact or condition of being produced.
2. That which is produced; a thing that results from any action, process, or effort; a product.
3. The action of bringing forward or exhibiting. In Law, the exhibiting of a document in court. to satisfy production, to produce and submit a document called for by a court of law (and thereby to admit the title of the pursuer and competence of the court).
4. Designating a vehicle or appliance made in the ordinary course of production, as opposed to one made for testing or other special purposes.

A proposed process to produce commercial hydrogen, based on the fact that certain photosynthetic microbes produce hydrogen from water in their metabolic activities.

A proposed process to produce commercial hydrogen, employing the electrolysis (splitting) of water by means of light energy.

Four equations, formulated by James Clerk Maxwell, that together form a complete description of the production and interrelation of electric and magnetic fields.

The statements of these four equations are as follows:

1. Electric field diverges from electric charge.
2. There are no isolated magnetic poles.
3. Electric fields are produced by changing magnetic fields.
4. Circulating magnetic fields are produced by changing electric fields and by electric currents.

Maxwell based his description of electromagnetic fields on these four statements.