why does balloon expand when heated

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why does balloon expand when heated	0.06	0.5	6111	95	35
why	0.56	0.2	9975	23	3
does	0.46	0.2	4928	40	4
balloon	1.75	0.3	5679	72	7
expand	1.34	0.4	657	55	6
when	1.52	0.7	2662	9	4
heated	1.06	0.4	2216	65	6

Keyword	CPC	PCC	Volume	Score
why does balloon expand when heated	0.65	0.2	4928	89
why does heat rise in a balloon	1.85	0.7	2556	23
do balloons expand in heat	0.77	0.3	6800	46
why do balloons expand as they rise	0.54	0.8	2768	57
does a balloon expand on warm day	1.42	0.5	255	3
what happens when a balloon is heated	1.05	0.1	3587	79
why does hot air balloon rise	1.02	0.8	1345	85
why does a balloon go up	0.48	0.5	5344	48
what caused the balloons to expand	0.04	0.9	1149	14
explain why a hot air balloon rises	0.75	0.8	1123	76
why does a balloon rise	1.44	0.7	8090	98
how did you make the balloon expand	1.27	0.1	4276	63
why do hot air balloons rise thermal	1.95	0.8	1399	65
what makes hot air balloon rise	1.71	0.1	7089	31