List some good ideas for science fair for sixth graders

You could test how high the soda shoots up when you drop mentos in different types of soda. i did it when i was in 6th grade

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.

Olá. porque a reação na temperatura é muito rapida a do copo : )