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All substances have distinct physical and chemical properties , and may undergo physical or chemical changes . Physical properties , such as hardness and boiling point , and physical changes , such as melting or freezing , do not involve a change in the composition of matter . Chemical properties , such flammability and acidity , and chemical changes , such as rusting , involve production of matter that differs from that present beforehand . Measurements provide the macroscopic information that is the basis of most of the hypotheses , theories , and laws that describe the behavior of matter and energy in both the macroscopic and microscopic domains of chemistry . Every measurement provides three kinds of information : the size or magnitude of the measurement -LRB- a number -RRB- ; a standard of comparison for the measurement -LRB- a unit -RRB- ; and an indication of the uncertainty of the measurement .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.