Understanding Energy Density and Kinetic Energy Spectrum

AI Thread Summary
Energy density refers to the amount of energy stored per unit volume, exemplified by calculating the energy density of a capacitor with 10 joules in a volume of 0.001 cubic meters, resulting in 10,000 joules per cubic meter. The concept of kinetic energy spectrum needs further clarification, as its context is not fully explained in the discussion. Participants inquire about applying the energy density concept to lithium batteries, suggesting that one can convert battery capacity in ampere-hours and use physical dimensions to calculate energy density. This approach is feasible if calculations are performed accurately. Understanding these concepts is essential for evaluating energy storage systems effectively.
Geolay
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and what is kinetic energy spectrum?
 
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Energy density is the amount of energy per unit of volume. So if I have 10 joules of energy stored in a capacitor, and the capacitor has a volume of 0.001 cubic meters, then the capacitor has an average energy density of 10 / 0.001 = 10 000 joules per cubic meter (for the electrical energy it stores, that is).

As for "kinetic energy spectrum", you're going to have to explain a little bit more. Where did you see those words together?
 
thank you.
 
Xezlec said:
Energy density is the amount of energy per unit of volume. So if I have 10 joules of energy stored in a capacitor, and the capacitor has a volume of 0.001 cubic meters, then the capacitor has an average energy density of 10 / 0.001 = 10 000 joules per cubic meter (for the electrical energy it stores, that is).
From a layman who has wandered in from the sticks, thank you. I glimmer of light for me.

Can I apply the above reasoning to say a lithium battery? i.e. convert the stated battery capacity in ampere hours and use the physical dimensions to arrive at an "energy density" for said battery, assuming I get my sums right?
 

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