Question: what theory is used to explain the behavior of particles in gases
[{'answer': 'Brownian motion', 'provenance': [{'wikipedia_id': '18993869', 'title': 'Gas', 'start_paragraph_id': 35, 'start_character': 11, 'end_paragraph_id': 35, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Microscopic.:Kinetic theory.\n'}]}, {'provenance': [{'wikipedia_id': '18993869', 'title': 'Gas', 'start_paragraph_id': 36, 'start_character': 0, 'end_paragraph_id': 36, 'end_character': 303, 'bleu_score': 0.957870874785216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10783184756122941676}, 'section': 'Section::::Microscopic.:Brownian motion.\n'}]}]