What Does W/(g2 cm3) Represent in Power Density Units?

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Homework Help Overview

The discussion revolves around the interpretation of the unit "W/(g2 cm3)", which is believed to relate to power density. Participants are exploring the meaning of the components of this unit, particularly the significance of the "g" in the context of power density measurements.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the meaning of "g" in the unit, with some suggesting it may refer to grams. There is also a discussion about the potential interpretation of the unit as "(W/g^2)/cm^3" and its relation to maximum power densities. Contextual inquiries about where the unit was encountered are raised, indicating a need for more information to clarify its usage.

Discussion Status

The conversation is ongoing, with participants providing insights and references to literature that mention the unit. Some have noted that the unit is often associated with vibration energy harvesting, but there is no explicit consensus on its interpretation yet. Guidance has been offered regarding the need for context to fully understand the unit's application.

Contextual Notes

Participants have pointed out that the original poster's inquiry lacks a complete problem statement, which is typically required in homework contexts. This has led to discussions about the nature of the question and the necessity of providing additional information for clarity.

joshmorris
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Homework Statement



So I saw a unit "W/(g2 cm3)"
And I'm pretty sure it's about power density...and I understand what W/cm3 is. It's watts per cubic centimeter...but what does the g mean? grams? If so, how does that fit in? :/[/B]
 
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Sure it wasn't ##(W/g^2)/cm^3##?
 
Student100 said:
Sure it wasn't ##(W/g^2)/cm^3##?

W/(g2 cm3) is the exact form
 
Can you give us any context?
 
joshmorris said:
W/(g2 cm3) is the exact form

That's okay, it's technically the same thing. I've only ever seen it written in this form in relation to power densities:

##(mW/g^2)/cm^3)##

Normally in reference to maximum power densities.

Yes, what is the context you saw it in?
 
Student100 said:
That's okay, it's technically the same thing. I've only ever seen it written:

##(mW/g^2)/cm^3)##

Normally in reference to maximum power densities.

Yes, what is the context you saw it in?

There are other places where I saw mW instead of W, what does it mean though?

-It is regarding maximum power densities
 
joshmorris said:
There are other places where I saw mW instead of W, what does it mean though?

Milliwatt
 
Last edited:
Student100 said:
Milliwatt.

Not mW I knew that, I meant the rest of it...like could you say it framed like "x cubic centimeters" or like full meaning in practical terms...
Like what does the g mean D:
 
Last edited:
joshmorris said:
I saw a unit "W/(g2 cm3)

Where? In what reference? In what context?

Without that sort of information we can't answer your question.

Also, is this homework? If so, you should be filling out the complete homework template, including an actual problem. What you've given isn't a problem, it's just a question.
 
  • #10
PeterDonis said:
Where? In what reference? In what context?

Without that sort of information we can't answer your question.

Also, is this homework? If so, you should be filling out the complete homework template, including an actual problem. What you've given isn't a problem, it's just a question.

Here's a paper that references it,

http://iopscience.iop.org/article/1...sessionid=D6364882AAD5BE845D65B93DAC700020.c1

Figure 4. Has units ##(W/g^2)/cm^3##

It almost always has something to do with vibration energy harvesting, I don't know that much about it. Just remember seeing it once before.
 

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