The plexiglass box (2 pieces) used in the experiment.

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Klara KOBETICOVA, Assistant Professor, PhD, Czech Technical University in Prague, Prague, ČVUT, Faculty of Civil Engineering (FSV)

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Basic properties of the studied sandstone.

Wow! Kids will have a blast as they learn while they play. This complete chemistry set includes everything a child needs to conduct real world experiments. Includes 28 pieces including safety goggles and easy to follow laminated instruction/experiment cards. Recommended for kids ages 5 to 12.

Dr. Stem Toys - Kids First Chemistry Set Science Kit - 28 Pieces All in A Storage Bucket

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Igor MEDVED, Professor, University of Constantinus the Philosopher in Nitra - Univerzita Konstant'na Filozofa v Nitre, Nitra, Department of Physics

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