Laboratory Experiment
Laboratory Experiment - Related Videos
07:27
Making Solutions in the Laboratory
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2023
The ability to successfully make solutions is a basic laboratory skill performed in virtually all biological and chemical experiments. A solution is a homogenous mixture of solute dissolved in bulk liquid known as the solvent. Solutions can be described by their solute concentration, a measure of how much solute is present per unit of solution. In this video, a step-by-step procedure for how to make a water-based, or aqueous, solution for biological applications is presented. The video...
08:00
Measuring Mass in the Laboratory
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2023
The analytical balance is the common piece of equipment in the scientific laboratory. These highly precise instruments can measure down to ten thousandths or even hundred thousandths of a gram. The triple beam balance is a type of scale that uses counterweights on a three rider beams to counterbalance the sample in the pan. On the other hand, modern analytical balances use a complex system of electronic sensors to accurately mass a substance. The analytical balance is so sensitive that it...
06:19
Decontamination for Laboratory Biosafety
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2023
Robert M. Rioux and Zhifeng Chen, Pennsylvania State University, University Park, PA Decontamination is essential for laboratory biosafety, as the accumulation of microbial contamination in the laboratory can lead to the transmission of disease. The degree of decontamination can be classified as either disinfection or sterilization. Disinfection aims to eliminate all pathogenic microorganisms, with the exception of bacterial spores on lab surfaces or equipment. Sterilization, on the other hand,...
05:28
Guidelines in Case of a Laboratory Emergency
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2023
Robert M. Rioux & Zhifeng Chen, Pennsylvania State University, University Park, PA The most common laboratory emergencies include chemical spills, fire or explosion, electric shock, and personnel injuries. Most laboratory accidents occur due to poor planning or lack of attention. Therefore, it's always better to prevent accidents (being proactive) than having to take any actions during an emergency (being reactive). For example, always wear proper personal protective equipment (PPE) in the...
06:58
The Factorial Experiment
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2023
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University A factorial design is a common type of experiment where there are two or more independent variables. This video demonstrates a 2 x 2 factorial design used to explore how self-awareness and self-esteem may influence the ability to decipher nonverbal signals. This video leads students through the basics of a factorial design including, the nature of a factorial design and what distinguishes it from...
FAQs
Changing a selected condition while holding other conditions consistent helps connect a measured response to that condition. For example, investigators can vary temperature, pH, light, moisture, or pollutant concentration and then compare resulting effects. This controlled contrast supports evaluation of cause-and-effect relationships in organisms, chemical reactions, or ecological processes.
Consistent procedures make results from different experimental conditions easier to compare. When investigators apply the same methods while altering selected variables, differences in observations or measurements can be linked more clearly to the changed condition rather than to procedural differences. This strengthens quantitative analysis and improves the usefulness of findings for environmental interpretation.
Temperature, pH, light, moisture, and pollutant concentration are examples of conditions that can be isolated for study. Their effects may be examined in organisms, chemical reactions, or ecological processes. Selecting among these variables allows an investigation to focus on how a specific environmental change influences a measurable biological, chemical, or ecological response.
Observation identifies the effects that occur under defined conditions, while quantitative analysis measures those effects systematically. Using both forms of evidence allows investigators to move beyond describing a response and evaluate its relationship to the changed environmental condition. The resulting measurements can support conclusions about environmental processes and contribute to evidence-based decision-making.
A typical plan begins with a hypothesis, followed by selection of an environmental condition to change and effects to measure. Investigators then maintain consistent procedures while examining organisms, chemical reactions, or ecological processes under defined conditions. Finally, they use observations and quantitative analysis to evaluate whether the results support a cause-and-effect relationship.
Controlled findings provide evidence about how organisms, chemical reactions, or ecological processes respond to specified environmental conditions. That information can contribute to environmental monitoring by clarifying measurable responses, and it can support risk assessment by examining effects associated with factors such as pollutant concentration. The value comes from connecting defined conditions with observed outcomes.
They are useful when investigators need to examine the effects of pollutant concentration under defined conditions. By maintaining consistent procedures and measuring resulting responses, researchers can study impacts on organisms, chemical reactions, or ecological processes. These findings contribute to pollution studies by providing controlled evidence that can be analyzed quantitatively alongside direct observations.
Results can show how defined changes in temperature, pH, light, moisture, or pollutant concentration affect environmental processes or organisms. Interpreting those responses provides evidence for developing strategies to protect ecosystems and manage natural resources. The experiments therefore connect controlled scientific investigation with practical environmental decisions, particularly when monitoring, pollution, or ecological effects require measured support.