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Quantitative results are measurements that are precise, for example, temperature, pressure, mass, length, etc. Qualitative results are more vague. They are descriptive by nature. For instance, you can say the when yeast are in a test tube of glucose solution there was bubbling. This doesn't explain the rate of reaction, simply that there were bubbles seen in the test tube, which is an observation. However, if you could actually count the bubbles released for a certain period of time and quantify your results, you could confidently say that 25 bubbles per minute were released inside the test tube. If one is conducting an experiment to test the growth of plants in a particular environment, qualitatively one could say, "that plant is taller than yesterday." However, quantitatively, it would be much more accurate to get a baseline measurement and daily measure the plant to try to ascertain the growth rate. Finally, someone can observe people at rest and hypothesize that their breathing rate seems slower than when they are active. However, without actually counting breaths and keeping data which is quantitative, for a large sample of people at rest and during activity, one cannot be sure about the validity of their observation.
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