1. Psychology experiments: In psychology, experiments are conducted to better understand human behavior, thoughts, and emotions. These experiments often involve observing participants' reactions to certain stimuli or situations, and measuring their psychological responses using various methods such as surveys, interviews, or brain imaging techniques. 2. Biological experiments: Biological experiments are conducted to study living organisms and their processes at the molecular, cellular, or organismal level. These experiments often involve manipulating biological systems, such as genes or proteins, and observing the effects on the organism's behavior or physiology. Common techniques used in biological experiments include DNA sequencing, cell culture, and animal studies. 3. Physics experiments: Physics experiments are conducted to study the fundamental laws of nature and the behavior of matter and energy. These experiments often involve measuring physical properties, conducting simulations, or building models to test theoretical predictions. Common physics experiments include measuring the speed of light, studying the behavior of particles in particle accelerators, and testing the principles of quantum mechanics. 4. Social science experiments: Social science experiments are conducted to study human society and social behavior. These experiments often involve manipulating social variables, such as social norms or group dynamics, and observing the effects on individual or group behavior. Common social science experiments include studies on conformity, obedience, and social influence. 5. Environmental experiments: Environmental experiments are conducted to study the impact of human activities on the environment and to develop strategies for sustainable resource management. These experiments often involve measuring environmental variables, conducting field studies, or modeling ecological systems. Common environmental experiments include studies on climate change, biodiversity conservation, and water pollution.