Balloons and Other Things That Sometimes Float

Hot air balloons float--sometimes. Regular old balloons that you get at a party float--sometimes. Boats float--sometimes. What makes them float and what makes them sink? How can a boat made of steel float but a solid chunk of steel sink to the bottom of the ocean? Part of the answer has to do with something called density, which will be discussed in this chapter. And yes, the concepts addressed in this chapter do have a lot to do with weather.

Grade Levels

Middle School


Aerospace Earth & Space Science General Science Physical Science Physics Technical and Vocational Education


Type Book ChapterPub Date 1/1/2005Stock # PB169X6_3

NSTA Press produces classroom-ready activities, hands-on approaches to inquiry, relevant professional development, the latest scientific education news and research, assessment and standards-based instruction.

Learn More