A central theme of science and scientific method is that all evidence must be empirical, or at least empirically based, that is, it should depend on evidence or results that can be observed by our senses. It should be noted here that scientific statements are subject to and derived from our experience or observations and empirical data is based on both observations and experiment results.
In the process of accepting or disproving any hypothesis, facts (evidence) are coupled with inference which is the act of deriving a conclusion on the basis of observations or experiment.
However, scientific evidence or empirical evidence is evidence where evidence does depend on inference thus it enables other researchers to examine the assumptions or hypothesis employed to see if facts are relevant at all to the support of or counter the hypothesis.
For example, an infective organism, "Helicobacter pylori", has shown to cause stomach ulcers in humans. Following evidence may prove the hypothesis that H. pylorus is indeed a cause of peptic ulcers in humans.
If someone voluntarily ingests H. pylori, it results in chronic gastritis
Experimental challenge to animals stimulates human infection and gastritis
Proper antimicrobial therapy in patients clears infection and thus clears gastritis
The H. pylori only found in gastric epithelium
There is a systemic immune response seen in patients with H. pylori infection
Antibodies against H. pylori disappears after successful antimicrobial therapy
Let's take another example of global warming which remains an ongoing dispute about the effects of humans on global climate. You may hear following evidence in favor or theory of global warming:
Graphs of historical trends show increasingly warming temperature
The levels of carbon dioxide gas are on the rise in atmosphere
The levels of methane are also rising
We are seen more frequent extreme weather as never before
Glaciers are disappearing rapidly
Arctic sea ice is melting
Antarctic sea ice is also melting
Greenland's ice sheet is also melting
Incidence of tropical diseases is on the rise
Oceans are warming with Coral bleaching and disintegration
No hypothesis or theory can be called scientific or accepted if it lacks empirical evidence in favor. Therefore, empirical evidence can be use both to accept or counter any scientific hypothesis or theory.
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