Decomposition of the white light and identification of the primary and secondary colours of the light. 

Having as background the Aveiro saltpans and all the procedure for obtaining salt from them (evaporation of water), an experience was planned in order to study the effect of solar radiation on the evaporation rate. A saltpan was simulated in the lab, prepared in a dark room (without natural sunlight), and, with a floodlight, we simulated the sun. We varied the angle of incidence of the radiation in the saltpan and then we measured the temperature as well as the range of mass of the saltpan during a certain hiatus of incidence of the floodlight. In order to study the water evaporation rate with and without wind, a fan was used.  

Adjective. not lasting, enduring, or permanent; lasting only a short time; existing briefly. Philosophy. person or thing that is transient, especially a temporary guest, boarder, laborer, or the like. Electricity. a sudden pulse of voltage or current

Fidget spinners work because there is a bearing in the centre. This is a good example of conservation of angular momentum, essentially the thing will keep spinning until there is an external moment, this is provided by the friction between the two rings. Ball bearings in between the two rings mean that as small as possible surface is touching between the two rotating rings, meaning friction is as low as possible. Skateboards, rollerblades, bikes and cars are all designed to waste as little as possible energy as heat and sound during friction between the axle and the wheel.

A short video that gives a detailed description of how solar panels work.

Plastics and Polymers have changed our world. They are a wonderful invention, however at the same time they are a source of great detriment because we don't have a good way of getting rid of them.

The idea of a redox reaction and the excessive production of gas is culminated in this fun demonstration for young children (the awe effect of producing this elephant toothpaste) and older ones that understand the notions of a redox reaction

Last year was easy, but for this year the challenge is still open

We all would like to be able to build a hydraulic arm. Thanks to this video, we will learn how to do it in a fun way.

Making a homemade speaker is easier than it seems. Thanks to this video, we will learn how to make portable speakers, without spending a lot of money.