Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Transcript of Scientific Method
The great advantage of the scientific method is that it is unprejudiced: one does not have to believe a given researcher; one can redo the experiment and determine whether his/her results are true or false. The conclusions will hold irrespective of the state of mind, or the religious persuasion, or the state of consciousness of the investigator and/or the subject of the investigation. Faith, defined as a belief that does not rest on logical proof or material evidence, does not determine whether a scientific theory is adopted or discarded.
A theory is accepted not based on the prestige or convincing powers of the proponent, but on the results obtained through observations and/or experiments which anyone can reproduce: the results obtained using the scientific method are repeatable. In fact, most experiments and observations are repeated many times (certain experiments are not repeated independently but are repeated as parts of other experiments). If the original claims are not verified the origin of such discrepancies is hunted down and exhaustively studied.
When studying the cosmos we cannot perform experiments; all information is obtained from observations and measurements. Theories are then devised by extracting some regularity in the observations and coding this into physical laws.
There is a very important characteristic of a scientific theory or hypothesis which differentiates it from, for example, an act of faith: a theory must be ``falsifiable''. This means that there must be some experiment or possible discovery that could prove the theory untrue. For example, Einstein's theory of Relativity made predictions about the results of experiments. These experiments could have produced results that contradicted Einstein, so the theory was (and still is) falsifiable.
The theory that “the moon is populated by little green men who can read our minds and will hide whenever anyone on Earth looks for them, and will flee into deep space whenever a space craft comes near” is not falsifiable: these green men are designed so that no one can ever see them. On the other hand, the theory that there are no little green men on the moon is scientific: you can disprove it by catching a little green man. Similar arguments apply to abominable snow-persons, UFO’s and the Loch Ness Monster.
A frequent criticism made of the scientific method is that it cannot accommodate anything that has not been proved. The argument then points out that many new things thought to be impossible in the past are now everyday realities. This criticism is based on a misinterpretation of the scientific method. When a hypothesis passes the test it is adopted as a theory it correctly explains a large range of phenomena it can, at any time, be falsified by new experimental evidence. When exploring a new set of phenomena scientists do use existing theories but, since this is a new area of investigation, it is always kept in mind that old theories might fail to explain the new experiments and observations. In this case new hypotheses are devised and tested until a new theory emerges.
There are many types of “pseudo-scientific” theories which wrap themselves in a mantle of apparent experimental evidence but that, when examined closely, are nothing but statements of faith.
This argument, cited by some creationists, that science is just another kind of faith is a philosophic stance which ignores the trans-cultural nature of science. Science’s theory of gravity explains why both creationists and scientists don’t float off into space.
All you have to do is jump to verify this theory – no leap of faith required.
Christopher A. Ervin
Vista Grande High School
Variables are an important part of science projects and experiments. What is a variable? Basically, a variable is any factor that can be controlled, changed, or measured in an experiment. Scientific experiments have several types of variables. The independent and dependent variables are the ones usually plotted on a chart or graph.
Types of Variables
The independent variable is the one condition that you change in an experiment.
Example: In an experiment measuring the effect of temperature on solubility, the independent variable is temperature.
The dependent variable is the variable that you measure or observe. The dependent variable gets its name because it is the factor that is dependent on the state of the independent variable.
Example: In the experiment measuring the effect of temperature on solubility, solubility would be the dependent variable.
A controlled variable or constant variable is a variable that does not change during an experiment.
Example: In the experiment measuring the effect of temperature on solubility, controlled variable could include the source of water used in the experiment, the size and type of containers used to mix chemicals, and the amount of mixing time allowed for each solution.