Chemistry teacher performing experiment for students in university laboratory
Chemistry teacher performing experiment for students in laboratory
Teacher in protective eyeglasses showing reagents flasks for making experiments at school lab
Two classmates kids schoolchildren listening to the chemistry science class lesson at school lab
Dissolved oxygen test
Small schoolkids pupils classmates using working with microscope at biology chemistry lesson
Dissolved oxygen test
African-american schoolgirl pupil student using working with microscope at biology chemistry
Students working in chemistry lab
Kids pupils making experiments with teacher using flasks with reagents at chemistry science lesson
Closeup of a purple pipette refilling chemistry glass tubes for analysis
Classmates kids schoolchildren making experiments listening to the chemistry science class
Two mixed-race multi-ethnic classmates kids schoolchildren listening to the chemistry
Classmates kids schoolchildren making experiments listening to the chemistry science class
Young caucasian teacher in protective eyeglasses showing reagents flasks for making experiments
Closeup view of Erlenmeyer flasks inside a laboratory
