Chapter 2: The science in the nature

The Colours of Autumn

I choose the same title that Still Acer because I want to explain something about the colours or autumn……

Do you know why the colour of the leaves is brown in autumn?

The leaves of the trees have chlorophyll, it is a green pigment. In the same way, the leaves have other kind of pigments such as yellows, oranges and red. Those are named carotenoid and there are of the same family that the pigments of the carrots. The amount of chlorophyll is greater than the carotenoid, so the colour green predominates. In autumn when the leaves are aging the level of chlorophyll decreases. So we can see the carotenoid pigments and this is why the leaves are brown and not green.

Chapter 1: The science in the kitchen

The kitchen is the place of our house where we have a lot of science and we don’t realise about it. So, we will consider some aspects to known a little more about this.

Do you know how the microwaves oven cooks foods and why it can heat the food and not the container?

Well, the answer is complicated because we have to use some physics but we can explain it without calculations in an intuitive way.

The microwaves produce changes in the vibration of the water molecules. It increases his vibration. When you increase the vibration of a molecule you are increasing his energy, so you are increasing his temperature. On the other hand, all the foods contain water molecules. I suppose that now you can ask the first question of today…. Yes, you are right! When you put your food in the microwaves, the water molecules increase their energy so they can heat the zone around them. And after a time it does that your food is ready for eat.

The second question has the same explanation because if you don’t have water molecules in the composition of the container, you can’t heat it. This is the microwaves oven secret; it only can heat if there are water molecules.

Welcome to acoustic science

This blog has been created with the objective to improve my English. This is part of the activities of my English 4th course. I would like that readers enjoy reading this blog so I have been thinking about it and I finally decide to write about the science in our lives, historical facts and other things…. For example, the first time that the clock was set forward one hour in summer and delayed in winter was in the First World War. Then there was a period when there were not any changes. However the change returns with the petroleum crisis in 1973 since now in order to take advantage of the sun light and to save energy. I explain this because tonight we have to change the clock, don’t forget it!!!

Pathfinder