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Roman/Arab numerals conversion disk

This disk converts Roman numerals into Arab numerals and vis versa.   Learning Roman numerals is a good way to exercise logic and counting.   Even if Roman numerals are no more in use today, they can still be found in our daily lives, on monuments, watch dials, to number book chapters, to date films, ... »
converts, versa, dials
Note
Difficulté
Durée0h 30 min.
Date22.07.2022
Langue(s)
français english

Catapult

This is a simple catapult model built with some very common objects.   This weapon of war was used in Greek and Roman Antiquity as well as in the Middle Ages. It could launch heavy stone bolders through a system of spring and without explosives.   This project is a good way to introduce children to ... »
catapult, weapon, explosives, mechanics
Note
Difficulté
Durée0h 30 min.
Date22.07.2022
Langue(s)
français english

Vaccuum bottle

This project goal is to build a simple and functional vaccum bottle ('thermos').   Instead of the 'air gap' used in commercial vaccuum bottles, this model uses various insulating materials. The insulation efficiency is reduced, but it can still keep a liquid cold or hot for several hours, ... »
thermos, insulating, insulation, demonstrating, trapped
Note
Difficulté
Durée1h 0 min.
Date22.07.2022
Langue(s)
français english

Solar oven

This project helps to understand how the greenhouse effect can be used to 'trap' the heat of the sun.   The sun's rays (short wavelengths of visible light) penetrate through the glass of the oven and heat the elements inside. When this heat is reissued as infra-red radiations (longer wavelengths) ... »
greenhouse, trap, rays, wavelengths, penetrate
Note
Difficulté
Durée2h 0 min.
Date22.07.2022
Langue(s)

Solar pendulum

This solar pendulum demonstrates different scientific principles : Concentration of sunlight rays with reflectors Greenhouse effect and absorption of solar radiation by dark colours Expansion and contraction of water due to temperature changes Transformation of solar thermal energy into ... »
pendulum, sunlight, rays, reflectors, greenhouse
Note
Difficulté
Durée3h 0 min.
Date22.07.2022
Langue(s)
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