The very first questions we need to answer are: Is all proof matter? What is matter? how do us classify and collect the matter that matters?

In stillproud.orgistry as in most sciences, issue is characterized as noþeles that has actually mass and also takes increase space. Matter can thus be weighed and also measured and the numbers created analyzed and compared because that the benefits of evidence or research. When we measure up the issue we will use, it is important to follow the rules of collection and also computation that store the measurements in a form that is qualified of comparison. What I mean by this is that you can�t weigh an object on a scale capable of only measuring to the 0.1 gram but report it come the 0.001 gram. That would certainly be claiming a degree of precision the does no exist in the measurement. The use of far-reaching figure rules will keep us native making this kind of mistake. We also need to establish that few of the evidence we will collect both in research and also in forensic investigation is no in reality matter. Observations, while not a form of matter are of significant value as soon as investigating. Observations fall under a kind of data dubbed qualitative data and are simply as necessary as quantitative (measured or calculated) data.

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Qualitative data is the monitorings investigator makes. While subjective in nature, this observations have actually value because they frequently will help an investigator at an early stage decide what proof to collect or the basic direction an examination should go. Collection of qualitative data might include surveying witnesses or suspects, taking pictures of crime scene or objects left in ~ a crime scene, etc. Due to the fact that of the spatu nature of the data, over there is more challenge in compare the results. We often say the data that this nature can be supplied to kind a consensus yet never an absolute answer such as we would obtain in quantitative data since of the problems with reproducibility.

Quantitative data is the collection of numbers. These numbers might be raw counts like just how many people were existing at a party or they might be measurements like the mass of an apple. The advantage to quantitative data is the is can be reproduced and is non-subjective in nature. This means if several different investigators attempted the measure they should all involved the same answer in ~ the standard deviation of the data.

### Main Points

Qualitative research involves evaluation of data such together words (e.g., indigenous interviews), photos (e.g., video), or objects (e.g., an artifact).

Quantitative research involves evaluation of number data.

There room strengths and also weaknesses of both qualitative and quantitative investigation.

Overly focusing on the debate of "qualitative versus quantitative" frames the methods in opposition. That is essential to focus additionally on how the techniques deserve to be integrated, such as in mixed techniques research. More great can come of developing an abilities in both realms than debating which technique is superior.

We currently defined the state physical and stillproud.orgical nature of matter in the an initial lecture, currently we will proceed with further specifying the nature of matter. We have the right to start v the state intensive nature versus comprehensive properties. Intensive properties are those nature of issue that do not count on the lot of the substance that is present. A perform of few of the most typical intensive nature is presented here:

 Intensive properties of Matter Color Odor Luster Boiling Point Hardness Malleability Ductility Conductivity

Gary, Please connect the definitions listed below to the photos as rollover or pop-up boxes.

Color - the wavelength of irradiate as viewed by the human eyeOdor - the home of a substance the activates the sense of smellLuster - how shiny a substance is. Boiling Point - The temperature in ~ which the vapor press of a fluid is same to the pressure on the liquid (generally atmospheric pressure). Hardness - How easily a substance deserve to be scratched.

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Malleability - The capability of a substance to it is in beaten right into thin sheets. Ductility - The ability of a substance to be attracted into thin wires. Conductivity - The capacity of a problem to enable the circulation of power or electricity. Density - The mass of a substance divided by that is volume Pressure - the force used per unit area that a problem

Note that every one of these properties (like the instance of thickness above) deserve to be measured or calculated and thus autumn under the realm of quantitative data. If you might not think of shade as gift a number, that in fact can be measured making use of a spectrometer and the wavelength the the color determined. Odors additionally are not immediately thought of in terms of numerical data but are in truth gaseous molecule that can be measure up by massive spectrometry to productivity the percentages of each component link by mass.

Extensive properties room the more commonly measured physical properties that matter and are dependency on the amount of problem present. Note below that mass and weight are listed as different items back we frequently use the two terms interchangeably. As long as we space on Earth, the mass and weight of an item are the same. If we move to the moon or Venus, the mass of an object will remain the same yet the weight will certainly change. A human being weighing 150 lbs on planet would just weigh 24.9 lbs on the moon and on Venus, 136 lbs. For this reason although the mass remains 150 lbs the weight changes based on the gravity of the planet. Other dimensions like volume and also length will certainly be the very same no matter where they space taken.

Extensive - Properties that do count on the lot of matter present:

1) massive or Weight

Difference in between Mass and also Weight

 Mass - A measure up of the amount of matter in things (grams). Weight - A measurement of the gravitational force of attraction of the planet acting on one object.

2) Volume: