Subject	thermal expansion
Predicate	be used
Object	to get a hot air balloon off the ground
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.4822
Neighborhood Sigma	0.7059
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source thermal expansion is used to get a hot air balloon off the ground 1 Answers.com Questions