Experiment Corner Hot + cold air
Experiment Corner Hot + cold air

Which slides down a slippery surface faster, a warm or a cold glass? We are going to find out the answer to this question in our latest edition of "Experiment corner".

Experiment Corner Hot + cold air

PLAKA test: Hot + cold air

Which slides down a slippery surface faster, a warm or a cold glass? We are going to find out the answer to this question in our latest edition of "Experiment corner". Another interesting question that will be answered is whether the PLAKA colour will last or fade during this test.

 

For this experiment we will require a wooden board with a very smooth surface. To achieve this, we will paint it with Pelikan PLAKA colours and then add a coat of Pelikan PLAKA Varnish. Should the board still not be smooth enough just add an extra coat on the areas that are not yet satisfactory.

After leaving to dry, our experiment can begin. Place the book under one end of the board and also have one bowel filled with warm and another filled with cold water ready

Das The glass is placed in the cold water for approx. one minute and then place with its opening facing downwards on the higher end of the board.

Finally, go through the same procedure with warm water (the glasses opening is also in this case facing downwards).

Observation

The warm glass slides down the tilted surface much faster and finally falls of the board. The cold glass on the other hand slides down much slower and even comes to a standstill.

The air in the warm glass stretches outwards. In this experiment it escapes from the glasses opening and forms an invisible cushion of air. The glass is lifted by this cushion and slides down the board making little contact to the surface and finally falls on the ground (be careful sweeping up the pieces should the glass break!!!)