In physics, dimensions refer to the fundamental quantities that are used to describe various physical phenomena. These dimensions are used to measure and quantify different aspects of the physical world. There are several dimensions that are commonly used in physics. Let's explore some of them:

1. Length (L): Length is a fundamental dimension that measures the extent of an object or a distance between two points. It is usually measured in meters (m). For example, the length of a pencil is about 15 centimeters (cm), or 0.15 meters (m).

2. Mass (M): Mass is another fundamental dimension that measures the amount of matter in an object. It is typically measured in kilograms (kg). For instance, the mass of an average apple is approximately 0.2 kilograms (kg).

3. Time (T): Time is a fundamental dimension that measures the duration or the sequence of events. It is commonly measured in seconds (s). For example, the time it takes for a car to travel from one point to another is 30 seconds.

4. Electric Current (I): Electric current is a fundamental dimension that measures the flow of electric charge. It is measured in amperes (A). For instance, a typical household electrical outlet can provide a current of 15 amperes (A).

5. Temperature (Θ): Temperature is a fundamental dimension that measures the hotness or coldness of an object or a system. It is usually measured in degrees Celsius (°C) or Kelvin (K). For example, the temperature of boiling water is 100 degrees Celsius (°C) or 373 Kelvin (K).

6. Amount of Substance (N): Amount of substance is a fundamental dimension that measures the quantity of a substance. It is measured in moles (mol). For instance, one mole of carbon atoms contains approximately 6.022 x 10^23 atoms.

These are just a few examples of the fundamental dimensions used in physics. It's important to note that these dimensions can be combined to form derived dimensions, such as velocity (L/T), acceleration (L/T^2), force (M⋅L/T^2), and many more.

References:
- Serway, R. A., & Jewett, J. W. (2017). Physics for Scientists and Engineers. Cengage Learning.
- Halliday, D., Resnick, R., & Walker, J. (2013). Fundamentals of Physics. John Wiley & Sons.

I hope this explanation helps! Let me know if you have any further questions.