# How do I know if the magnetic flux is positive and negative. (1 Viewer)

#### Everwinter

##### Member
As the question, how can I know if the magnetic flux is a positive value or a negative value? I searched that positive flux leaves a closed surface, and negative flux enters a closed surface. If this the case, does this mean the flux below an area would be different from the flux above an area?

#### tito981

##### Active Member
I though magnetic flux was a scalar quantity, so wouldn't the negative imply that it is a vector?

#### Everwinter

##### Member
its scalar but can be both positive and negative, because its derived from integration I think, which can be negative

#### tito981

##### Active Member
Im sure it won't be accessed in the hsc.

#### idkkdi

##### Well-Known Member
I though magnetic flux was a scalar quantity, so wouldn't the negative imply that it is a vector?
Look up signed scalars. Scalars can have a sign since they’re a value relative to something. Temperature u might wrongly say is a vector because -10 degrees C, but if you take it relative to absolute zero it’s always positive. The sign is not a direction but more so something to indicate its magnitudes value.

#### tito981

##### Active Member
i think magnetic flux is an absolute scale unlike temp

#### idkkdi

##### Well-Known Member
i think magnetic flux is an absolute scale unlike temp
U can look into it on like stack exchange.