The maintenance of a physical quantity, such as energy or mass, during a physical or chemical change.
A rapid, persistent chemical change that releases heat and light and is accompanied by flame, especially the exothermic oxidation of a combustible substance.
With a change in consciousness, actual chemical changes occur.
thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change.
In an unexposed light-sensitive emulsion or coating, the slow chemical change that occurs when the material is stored in an unlighted area.
A change is not a chemical change unless it results in forming a new substance.
The result showed physiological and bio-chemical change of Chinese Milk Vetch with PVA pretreatment have adapted stress of low temperature before winter.
A chemical change takes place in any substance when it burns.
Microorganisms are the agents that bring about the chemical change.
An example of irradiation causing an obvious chemical change in food is the inducement of rancidity in foods containing unsaturated fats when oxygen is present. The process is closely related to that which normally takes place when such foods are stored.
A chemical change takes place in paper when it burns.
A powder coating designed to undergo an irreversible chemical change during heating and will not revert to the liquid stage when reheated.
In the growth and decay of living things there occur even more complex types of slow chemical change.
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