Chapter 1
Introduction: Matter and Measurement
![Scientific Laws and Theories](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11230.jpg)
In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It…
![The Scientific Method](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11231.jpg)
Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions.…
![Classifying Matter by Composition](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11233.jpg)
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is…
![Physical and Chemical Properties of Matter](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11234.jpg)
The characteristics that enable us to distinguish one substance from another are called properties.
A physical property is a characteristic of…
![Measurement: Standard Units](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11236.jpg)
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the…
![Measurement: Derived Units](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11237.jpg)
The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length,…
![Uncertainty in Measurement: Reading Instruments](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11239.jpg)
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process.…
![Uncertainty in Measurement: Significant Figures](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11240.jpg)
All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a…
![Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions](https://cloudfront.jove.com/files/thumbs/54179_t.png)
Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
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The use of natural gas continues to grow with increased discovery and production of unconventional shale resources. At the same time, the natural gas…
![Calibrated Passive Sampling - Multi-plot Field Measurements of NH<sub>3</sub> Emissions with a Combination of Dynamic Tube Method and Passive Samplers](https://cloudfront.jove.com/files/thumbs/53273_t.png)
Agricultural ammonia (NH3) emissions (90% of total EU emissions) are responsible for about 45% airborne eutrophication, 31% soil acidification and…