Density

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit *area*?

Am I crackers or has Joe Beer got a fundamental knowledge/understanding
gap in the latest issue of 'Cycle'?

--
Helen D. Vecht: [email hidden]
Edgware.

BMI = body weight in kilograms/height in meters squared. Another expression
of density that is measured as mass per unit area is sectional density,
which is used in a number of fields including my own, acoustics.

Gordon
--
Subtract 1 from 11 to reply

Helen Deborah Vecht [email hidden] opined the following...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit *area*?

Am I crackers or has Joe Beer got a fundamental knowledge/understanding
gap in the latest issue of 'Cycle'?

I bounced off that as well, then chose to ignore it. The rest of the
article seemed reasonably sound.

While on the subject of Cycle:

Trice XXL reviewed last time (Or time before, I don't remember).
Touring holiday on recumbent bikes reported in the current one.

The Dark Side is on the move. ;-)

Jon

In news:[email hidden],

Beth-Jen said:

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit
*area*?

Am I crackers or has Joe Beer got a fundamental
knowledge/understanding gap in the latest issue of 'Cycle'?

--
Helen D. Vecht: [email hidden]
Edgware.

BMI = body weight in kilograms/height in meters squared. Another
expression of density that is measured as mass per unit area is
sectional density, which is used in a number of fields including my
own, acoustics.

Gordon

I'm afraid my height isn't in meters squared. Does that make me a bad
person?
--

Martin Bulmer

Beth-Jen said:

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit *area*?

Am I crackers or has Joe Beer got a fundamental knowledge/understanding
gap in the latest issue of 'Cycle'?

--
Helen D. Vecht: [email hidden]
Edgware.

BMI = body weight in kilograms/height in meters squared. Another expression
of density that is measured as mass per unit area is sectional density,
which is used in a number of fields including my own, acoustics.

Which makes its units kg.m-2, which could be expressed as mass per unit
area, but not in any particular meaningful manner.

--
Trevor Barton

Trevor Barton said:

Quoted message said:

BMI = body weight in kilograms/height in meters squared. Another expression
of density that is measured as mass per unit area is sectional density,
which is used in a number of fields including my own, acoustics.

Which makes its units kg.m-2, which could be expressed as mass per unit
area, but not in any particular meaningful manner.

It's a similar concept to column density, which is expressed in kg m-2,
being the density integrated along a line between two points.

In a very broad (and very arguable) handwavy way, it makes sense for BMI
to be tbought of as the column density on a front-to-back line, a) an
average person's width is broadly proportional to their height (so
frontal area is simply proportional to height^2, which is far easier to
measure than frontal area), and b) fat starts to pile on the front and
back of most people before it starts on the sides.

R.

"Martin Bulmer" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

In news:[email hidden],

Beth-Jen said:

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit
*area*?

Am I crackers or has Joe Beer got a fundamental
knowledge/understanding gap in the latest issue of 'Cycle'?

--
Helen D. Vecht: [email hidden]
Edgware.

BMI = body weight in kilograms/height in meters squared. Another
expression of density that is measured as mass per unit area is
sectional density, which is used in a number of fields including my
own, acoustics.

Gordon

I'm afraid my height isn't in meters squared. Does that make me a bad
person?

Apparently so.

Quoted message said:

--

Martin Bulmer

"Beth-Jen" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit

*area*?

Quoted message said:

Quoted message said:

Am I crackers or has Joe Beer got a fundamental knowledge/understanding
gap in the latest issue of 'Cycle'?

--
Helen D. Vecht: [email hidden]
Edgware.

BMI = body weight in kilograms/height in meters squared. Another

expression

Quoted message said:

of density that is measured as mass per unit area is sectional density,
which is used in a number of fields including my own, acoustics.

What is the best method of sound proofing?

Quoted message said:

Gordon
--
Subtract 1 from 11 to reply

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit *area*?

Am I crackers or has Joe Beer got a fundamental knowledge/understanding
gap in the latest issue of 'Cycle'?

We are all made of the same "stuff" so we will all have a similar density.

It is just an approximation I believe, for instance they use a different
BMI
for children. So it only appears to work for a small range or heights.

A better idea of if you are over weigh is if people stare at you when
you waddle down the street.

Quoted message said:

--
Helen D. Vecht: [email hidden]
Edgware.

On Mon, 29 Nov 2004 19:53:56 -0000, "half_pint"
<[email hidden]> wrote in message
<[email hidden]>:

Quoted message said:

We are all made of the same "stuff" so we will all have a similar density.

Please, Sir, isn't a cyclist denser than yer average lardarse?

Guy
--
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

88% of helmet statistics are made up, 65% of them at Washington University

"half_pint" <[email hidden]>typed

Quoted message said:

We are all made of the same "stuff" so we will all have a similar density.

Fat is less dense though.

Quoted message said:

It is just an approximation I believe, for instance they use a different
BMI
for children. So it only appears to work for a small range or heights.

True. A different mass index of the mass/height^3 would be more
informative and work better at extremes of height, and for children.

Quoted message said:

A better idea of if you are over weigh is if people stare at you when
you waddle down the street.

You could also see if some stock sized clothing fits...

--
Helen D. Vecht: [email hidden]
Edgware.

"half_pint" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

"Beth-Jen" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Is density mass per unit volume and body mass index mass per unit

*area*?

Quoted message said:

Quoted message said:

Am I crackers or has Joe Beer got a fundamental knowledge/understanding
gap in the latest issue of 'Cycle'?

--
Helen D. Vecht: [email hidden]
Edgware.

BMI = body weight in kilograms/height in meters squared. Another

expression

Quoted message said:

of density that is measured as mass per unit area is sectional density,
which is used in a number of fields including my own, acoustics.

What is the best method of sound proofing?

Quoted message said:

Depends

Gordon
--
Subtract 1 from 11 to reply

Helen Deborah Vecht said:

You could also see if some stock sized clothing fits...

"Stock sizing" has been increasing at a rapid rate!

More rapid than my wife, anyhow.

(I never fitted stock sized clothing in the first place, since about age 15)

James
--
If I have seen further than others, it is
by treading on the toes of giants.
http://www.ne.jp/asahi/julesandjames/home/

"Helen Deborah Vecht" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

"half_pint" <[email hidden]>typed

Quoted message said:

We are all made of the same "stuff" so we will all have a similar

density.

Quoted message said:

Fat is less dense though.

Quoted message said:

It is just an approximation I believe, for instance they use a

different

Quoted message said:

Quoted message said:

BMI
for children. So it only appears to work for a small range or heights.

True. A different mass index of the mass/height^3 would be more
informative and work better at extremes of height, and for children.

Maybe true and it seems sensible, I assume it does not work too well
in practice.

Quoted message said:

Quoted message said:

A better idea of if you are over weigh is if people stare at you when
you waddle down the street.

You could also see if some stock sized clothing fits...

Depends where you shop I guess, more fashionable shops will not stock
large sizes but some stores recognise "big boned" people as a significant
part of their market. You often see XL and XXL sizes.

Quoted message said:

--
Helen D. Vecht: [email hidden]
Edgware.