when was poison gas invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was poison gas invented	0.71	0.6	5362	16	28
when	1.48	0.4	7003	28	4
was	0.51	0.8	9529	49	3
poison	1.82	0.8	3577	74	6
gas	1.79	0.7	440	70	3
invented	1.14	0.8	9756	78	8

Keyword	CPC	PCC	Volume	Score
when was poison gas invented	1.04	0.5	6817	42
when was poison gas invented ww1	0.07	1	9882	60
who invented poison gas	1.36	0.6	5609	24
who invented poison gas in ww1	0.54	0.8	1976	60
what year was poison gas invented	0.73	0.7	5884	7
where was poison gas invented	1.17	0.2	4714	83
why was poison gas invented	0.59	0.9	3342	35
when was poison gas first invented	1.41	0.8	2733	79
what country invented poison gas	0.41	0.9	6630	9
how was poison gas created in ww1	1.28	0.2	8172	58
what was poison gas ww1	0.8	1	1597	65
how was poison gas made in ww1	1.06	0.8	2276	28
poison gas in ww1 definition	0.46	0.6	7020	11
facts about poison gas ww1	1.48	0.9	2719	10
first use of poison gas in wwi	1.31	0.1	5229	84
poison gas in world war 1	1.06	0.6	1546	64