Keyword Analysis & Research: what do square brackets mean in chemistry

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what do square brackets mean in chemistry	0.09	0.5	3444	70	41
what	1.72	0.1	8176	20	4
do	0.62	0.2	1908	91	2
square	0.02	0.9	4448	61	6
brackets	1.03	0.3	7265	9	8
mean	0.49	0.7	2070	60	4
in	0.46	0.2	3639	96	2
chemistry	0.96	0.5	8455	73	9

Keyword	CPC	PCC	Volume	Score
what do square brackets mean in chemistry	0.93	0.1	8212	18