What is density of magnetic field?

[boris16]

hiya

I would appreciate if the following questions be answered with words, not numbers ( I like analogies :) ). Else, don't bother since it won't help much.

EF ... electric field
MF ... magnetic field


1)

When talking about static electricity the electric field lines represent the strength of EF.

What do magnetic field lines represent? My first thought was the strength of magnetic field,
but then they could also represent magnetic field density B.
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2)

I imagined EF and MF as some kind of alteration of the space, meaning it's not like the field is more dense in certain places. So we can't talk about MF and EF as having more "substance"
near the source of this field. Indeed,the forces are stronger near the source, but doesn't mean the field is more dense or whatever.
So how can we talk about the density of the field?
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3)

So what exactly is the difference between the strength of MF and density of MF?
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thank you

 

[Greg Bernhardt]

The density of a magnetic field is defined as the magnetic flux density divided by the volume. It is denoted by B or μ, the term is typically used within the context of magnetism, where it is the proportionality constant between the magnetic field and the magnetic flux density. The term permeability is used for magnetic materials, and is denoted by μ or. The term is due to Oliver Heaviside, who named it thus in honor of the Scottish physicist William Thomson, in many practical cases, the permeability and the relative permeability are closely related.