Natural Science and Mathematics

This portal is all about natural science and math. You can check out the sub portals mathematics and statistics, physics, chemistry, biology, geography as well as astronomy and space:


Computer Science, Geography and Human Sciences

For topics on computer science, see the portal Programming and Computer Science, for humanities topics refer to the portal Art, Culture, People, Politics and Society

Other scientific topics such as geography, weather, environment and ecology, can be found in the portal Nature, Environment, Animals and Plants.

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Explanation: Exothermic and Endothermic Reaction
Today, we have learned about exothermic and endothermic reactions in school. Unfortunately, I do not understand this topic! :(...
Open Question | 1 Answer
Examples for Exothermic and Endothermic Reactions
Our chemistry teacher wants us to put together some examples of exothermic and endothermic chemical reactions over the...
Question | 1 Answer
Local Gravity on the Moon
Everybody knows since the sixth grade that the mean local gravity (gravitational acceleration) on earth is 9.81 m/s² (...
Question | 1 Answer
How many seconds does a day have?
Of how many seconds does a complete day actually consist? Does anyone know? That must really be quite a...
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Local Gravity for different Places and Planets
In this article I would like to contrast the location factor, the local mass difference, the gravitational acceleration or...
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How much lighther are you on the moon?
It is said that one is much lighter on the moon than on earth. Even the heaviest of us earthlings is as light as a feather...
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New Answers and Comments

Chematik: Here is an explanation of exothermic and...
Question | Explanation: Exothermic and Endothermic Reaction
Chematik: In an exothermic reaction, energy is released to the environment, in an endothermic reaction, energy is absorbed from the environment....
Question | Examples for Exothermic and Endothermic Reactions
Science5000: The local gravity respectively location factor on the surface of the moon is 1.62 m/s². This makes the same object about six times lighter...
Question | Local Gravity on the Moon
Square: 1 day = 86400 seconds The calculation is quite simple: 1 day consists of 24 hours, each of these hours consists of 60 minutes...
Question | How many seconds does a day have?
Science5000: You are six times lighter on the Moon than on Earth. In other words, if the scale on Earth shows 80 kilograms, the value on...
Question | How much lighther are you on the moon?
Science5000: There are two main reasons for that: The centrifugal force and the equatorial bulge. As we all know, our earth rotates around...
Question | Why is the local gravity at the poles greater than at the equator?

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