What is "Height*Width at Half Height"?

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Discussion Overview

The discussion revolves around the concept of "height*width at half height," particularly in the context of gas chromatography and mathematical representations of curves, such as normal distributions. Participants seek to clarify the meaning and implications of this term, exploring its mathematical significance and application.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant questions the meaning of "height*width at half height" and seeks clarification on the formula involved.
  • Another participant suggests that if the width is at half the height, it implies a specific relationship between the dimensions, indicating the object is twice as long as it is wide.
  • Several participants inquire about the context of the question, with one clarifying that it relates to gas chromatography but is fundamentally a mathematical question.
  • A participant explains that the maximum y-value of a graph represents the height, and that the width at half maximum can be determined from the x-values where the distribution equals half of the maximum value.
  • One participant describes the concept using a normal distribution, stating that the product of height and width at half height could measure the sharpness of the peak.
  • Another participant counters that for a normal distribution, the product of width and height represents the area under the curve, which is always equal to 1, suggesting that sharpness does not affect the total probability.

Areas of Agreement / Disagreement

Participants express differing interpretations of the term "height*width at half height," with some proposing it as a measure of sharpness while others argue it relates to the area under the curve. The discussion remains unresolved, with multiple competing views presented.

Contextual Notes

Participants have not reached a consensus on the implications of the term, and there are unresolved assumptions regarding the definitions and applications of height and width in various contexts.

sotellme
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what does it mean when it says; " height*width at half height " ?

so far i just know that height multiply with width but what does it mean with " at half height" ?


does anyone know what kind of formula is this?

thanks!
 
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If width is at half the height, that means the thing is twice as long as it is wide...
 
What is the context of this question?
 
cyby said:
What is the context of this question?


about gas chromatography...but this is a math question.

instead of writing it in words can you express it in numbers, because i still don't get what you mean with words :blushing:

thanks!
 
Well, can I look at the question verbatim please?
 
Look at the graph and determine where its maximum is. The y-value at that point (ordinate) is referred to the "height." If the spectrum (distribution) is monotonically decreasing from its maximum value then you can find two unique locations where the value of the distribution is half its maximum value. The difference in x-values (abscissas) between those points is referred to as the "width at half maximum."
 
Think of a curve such as a normal distribution. The peak is the height. You can also measure the width of the curve at half of this height. Multiplying height*(width at half height) would give you some measure of the sharpness of the peak.
 
rdt2 said:
Think of a curve such as a normal distribution. The peak is the height. You can also measure the width of the curve at half of this height. Multiplying height*(width at half height) would give you some measure of the sharpness of the peak.

Not really. In fact, for a normal distribution, the product of width and height is a measure of the area under the curve which is 1. The area, in this case is the total probability and it makes no difference how sharply peaked the curve is.
 
thanks all! :smile:
 

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