What is the Scientific Method?
The scientific method is a process for experimentation that is used to explore observations and answer questions. Does this mean all scientists follow exactly this process? No. Some areas of science can be more easily tested than others. For example, scientists studying how stars change as they age or how dinosaurs digested their food cannot fast-forward a star's life by a million years or run medical exams on feeding dinosaurs to test their hypotheses.…
What are Variables?
Scientists try to figure out how the natural world works. In doing so, they use experiments to search for cause and effect relationships. Cause and effect relationships explain why things happen and allow you to reliably predict what will happen if you do something. In other words, scientists design an experiment so that they can observe or measure if changes to one thing cause something else to vary in a repeatable way.
The things that are changing in an…
What is the Engineering Design Process?
The engineering design process is a series of steps that engineers follow to come up with a solution to a problem. Many times the solution involves designing a product (like a machine or computer code) that meets certain criteria and/or accomplishes a certain task. This process is different from the Steps of the Scientific Method, which you may be more familiar with. If your project involves making observations and doing experiments, you…
A bibliography is a listing of the books, magazines, and Internet sources that you use in designing, carrying out, and understanding your science fair project. But, you develop a bibliography only after first preparing a background research plan — a road map of the research questions you need to answer. Before you compose your bibliography, you will need to develop your background research plan.
With your background research plan in hand, you will find sources of information…
What does it mean for a solution to be acidic or basic (alkaline)?
It all has to do with hydrogen ions (abbreviated with the chemical symbol H+). In water (H2O), a small number of the molecules dissociate (split up). Some of the water molecules lose a hydrogen and become hydroxide ions (OH−). The "lost" hydrogen ions join up with water molecules to form hydronium ions (H3O+). For simplicity, hydronium ions are referred to as hydrogen ions H+. In pure water, there are an equal number of…
It would be useful to have a measure of scatter that has the following properties:
The measure should be proportional to the scatter of
the data (small when the data are clustered together, and large when
the data are widely scattered).
The measure should be independent of the number of values
in the data set (otherwise, simply by taking more measurements the
value would increase even if the scatter of the measurements was not
Below are standard formats and examples for basic bibliographic information recommended by the American Psychological Association (APA). For more information on the APA format, see http://www.apastyle.org.
Your list of works cited should begin at the end of the paper on a new page with the centered title, References. Alphabetize the entries in your list by the author's last name, using the letter-by-letter system (ignore spaces and other punctuation.) Only the initials of the…
7-bit ASCII Character Codes
The ASCII table contains letters, numbers, control characters, and other symbols. Each character is assigned a unique 7-bit code. ASCII is an acronym for American Standard Code for Information Interchange.
Many electronics projects use something called a breadboard. What is a breadboard, and how do you use it? This tutorial video will give you a basic introduction to breadboards and explain how to use them in beginner electronics projects; you can also read more details and see more examples in the text sections.