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A rough calculation or an approximation of the value, number, quantity, or extent of something so that it is usable for some purpose even if the input data may be incomplete or uncertain.
2
votes
2
answers
137
views
Why don't we have underground thermal power plants? [closed]
I learned from wikipedia that for the production of electricity, the temperature of geothermal sources must be at least 150 degrees Celsius.
Also wiki says that at a depth of 6 kilometers, the tempera …
1
vote
0
answers
68
views
How long will oxygen last in a $3\times 3\times 3 $ meter room for one person? [closed]
Let's assume that the windows and doors are tightly closed.
How can I calculate at what moment I will feel a lack of oxygen and my well-being will worsen?
Can one person completely consume all the ai …