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Vzduch – plynná látka. Vieme aj to, že čiastočky plynných látok sa rozpínajú do všetkých strán.
Nové, čo sme sa dozvedeli bol tlak vzduchu a hmotnosť vzduchu. Tlak vzduchu drží vodu v pohári
– aj to sme si vyskúšali na hodine Prírodovedy. Pokus s balónikmi nám dokázal, že vzduch má
hmotnosť. Papier v pohári potopený v mise s vodou zostal suchý. Prečo? Aj tieto pokusy nám
pomáhajú objavovať jedinečnosť a krásu neživej prírody.