540 atmosfeer biochemistry chemicalreactions chemistry chemistrytextbooks chimie college einführung electricity elektronen energie(exactewetenschappen) engineering engineering(general) exercises experiments general generalchemistry guides hydrosfeer ingenierie ingénierie leerprocessen lehrbuch manuels materie methodology milieuverandering natuurconstanten natuurkunde natuurwetenschappen oorsprong open_syllabus_project physicalandtheoreticalchemistry problems problèmesetexercices reference science science/mathematics scienceteachers sciencetextbooks studyandteaching tables tables[data] technischewetenschappen technology textbooks trainingof vakdidactiek vastestoffen