# if capacitance is mentioned in F/g, query.

#### Raghu bvrvk

Joined May 4, 2021
1
if capacitance is mentioned in F/g then how to calculate total capacitance

#### Papabravo

Joined Feb 24, 2006
16,835
if capacitance is mentioned in F/g then how to calculate total capacitance
What is F/g? I am not familiar with that expression and have no idea what connection it may or may not have to capacitance.
In mechanics F/g could be interpreted as a way of defining mass, as the force exerted on a small object by a large one, divided by the acceleration of gravity.

#### Yaakov

Joined Jan 27, 2019
3,523
What is F/g? I am not familiar with that expression and have no idea what connection it may or may not have to capacitance.
In mechanics F/g could be interpreted as a way of defining mass, as the force exerted on a small object by a large one, divided by the acceleration of gravity.
Iti s specific capacitance. I am not completely certain but I don't think it is possible to use specific capacitance alone to decide the total capacitance of a practical device.

#### Papabravo

Joined Feb 24, 2006
16,835
Iti s specific capacitance. I am not completely certain but I don't think it is possible to use specific capacitance alone to decide the total capacitance of a practical device.
That is a new concept. what is specific capacitance? If so what is the reference?

#### AnalogKid

Joined Aug 1, 2013
9,362

• Papabravo

#### Papabravo

Joined Feb 24, 2006
16,835
Kudos! That one came out of left field. Checking datasheets on 0.1 μF 0402 ceramic bypass caps to see it they quote a weight.

#### Yaakov

Joined Jan 27, 2019
3,523
That is a new concept. what is specific capacitance? If so what is the reference?
It's particularly relevant to super capacitors and my understanding is that it give a capacitance per gram of a material for comparison against other materials to decide which has a higher chance of making a good cap.

#### ericgibbs

Joined Jan 29, 2010
13,670

#### BobTPH

Joined Jun 5, 2013
3,691
To answer the question, now that we know what F/g means, You would multiply the F/g by the mass in grams to get capacitance in Farads.

Bob

#### Yaakov

Joined Jan 27, 2019
3,523
To answer the question, now that we know what F/g means, You would multiply the F/g by the mass in grams to get capacitance in Farads.

Bob
I don't think it's that simple. The term F/g can only refer to the active material in a capacitor, that's only a percentage of the mass. There are also other factors that determine the measured capacitance of a practical device. At least that's how I understand it.

#### Papabravo

Joined Feb 24, 2006
16,835
I don't think it's that simple. The term F/g can only refer to the active material in a capacitor, that's only a percentage of the mass. There are also other factors that determine the measured capacitance of a practical device. At least that's how I understand it.
At least that product would be within a potential scaling factor.

• Yaakov