Tekoči dušik in obravnava lastnosti snovi v 3. razredu osnovne šole

Juhant, Alenka (author), Čepič, Mojca (mentor)

V literaturi lahko najdemo širok nabor raznolikih poskusov s tekočim dušikom. Tekoči dušik je tekočina z vreliščem pri –196 °C. Lahko ga uporabimo kot pripomoček pri poučevanju, saj omogoča prikaz različnih pojavov, zaradi svoje nenavadnosti pa poleg tega učence visoko motivira za delo. Ker v literaturi nismo zasledili poročil o uporabi tekočega dušika na razredni stopnji, nekatere pojave pa bi ta tekočina primerno ilustrirala, smo v raziskavi oblikovali zbirko demonstracijskih poskusov za 3. razred osnovne šole na temo lastnosti snovi. Načrtovali smo učno uro, jo izvedli in evalvirali zbirko zasnovanih poskusov ter ob njih izvedeni učni poseg. Raziskava je temeljila na deskriptivni in kavzalno-neeksperimentalni metodi. Uporabljen je bil kvalitativni pristop. Preučevan je bil neslučajnostni, priložnostni vzorec 36 učencev. Podatke smo zbrali z delovnim listom, nalogo za preverjanje spretnosti napovedovanja in s krajšim polstrukturiranim intervjujem. Raziskava je pokazala veliko učno motiviranost učencev zaradi uporabe tekočega dušika pri poučevanju. Učenci so napredovali v »naravoslovni« spretnosti načrtovanje pri spoznavanju okolja. Intervju je omogočil prepoznavanje napačno oblikovanih predstav o tekočem dušiku, njegovih lastnostih in uporabi. Oblikovana zbirka poskusov omogoča spoznavanje spreminjanja krhkosti in trdnosti snovi, spreminjanje prostornine plina pri stalnem tlaku pri spreminjanju temperature, prikaz aktualne uporabe tekočega dušika v gospodinjstvu ter ilustriranje hitre spremembe agregatnega stanja.

• Language: Unknown
• Keywords: demonstracijski poskusi
• Work type: Not categorized
• Organization: PEF - Faculty of Education
• Year: 2015
• PID: 20.500.12556/RUL-72828
• COBISS.SI-ID: 10736457
• Publication date in RUL: 03.10.2015

JUHANT, Alenka, 2015, Tekoči dušik in obravnava lastnosti snovi v 3. razredu osnovne šole [online]. 2015. [Accessed 27 August 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=72828

Secondary language

• Language: Unknown
• Title: Liquid nitrogen and teaching properties of matter in the 3rd grade of primary school

Abstract

A wide range of diverse experiments with liquid nitrogen can be found in the literature. Liquid nitrogen is a liquid with a boiling point at –196 ° C. Not only can it be used as a tool for teaching because it allows displaying different phenomena, but also highly motivates students to work in addition to its strangeness. In the literature we did not find reports on the use of liquid nitrogen at primary level. Since this liquid can properly illustrate certain phenomena, this study was to create a collection of demonstration experiments for the third grade of primary school on the properties of matter. We planned lesson, performed and evaluated the collection of experiments and an educational intervention. The study is based on descriptive and causal-experimental method. This was a qualitative approach. It was investigated on occasional sample of 36 students. Data were collected with the worksheet, the task of checking predicting skill and with a short semi-structured interview. The survey showed a lot of learning motivation of pupils with the use of liquid nitrogen in the classroom. Students promoted in "science" predicting skills. The interview has enabled the identification of incorrectly formulated ideas about liquid nitrogen, its properties and its use. Designed collection of experiments enables learning about changing the fragility and strength of materials, changing the volume of the gas at constant pressure when changing temperature, shows the current use of liquid nitrogen in the cooking and illustrate the rapid change in physical state.

• Keywords: demonstration experiments