Hello and welcome back to another episode of Physics Partner. Today we are going to delve into one of the most fundamental concepts in thermodynamics, the Zero-th Law. With nearly endless real life applications, understanding the Zero-th Law is essential in a variety of fields including physics, engineering and chemistry. In this video I will be breaking down the concept of the Zero-th Law and sharing real life applications to help you understand and appreciate it even more. So let's dive in. What is the Zero-th Law of Thermodynamics? The Zero-th Law of Thermodynamics is one of the four fundamental laws of thermodynamics. It states that if two systems are in thermo equilibrium with a third system, then the two initial system, the first one, are also in thermal equilibrium with each other. If I further simplify this definition, it implies that temperature is a fundamental and measurable property for all matter. The Zero-th Law is essential as it helps us set a fixed point of temperature which we can use to compare different systems. In fact, it has long been established that fundamental temperature scales are based on the Zero-th Law of Thermodynamics. Let's talk about the real-life application of Zero-th Law. One of the practical applications of the Zero-th Law is found in household items such as an air conditioner. The air conditioner works by removing heat from a room and moving it outside. Inside the AC unit there is a thermometer that major the unit's internal temperature. When the temperature detects a high temperature then the desired setting, the air condition will turn on to bring the temperature down to the desired temperature. The Zero-th Law helps the AC unit to reach thermal equilibrium through monitoring the temperature. Another example is found in the food industry, where temperature monitoring is critical to ensure food safety. Cold storage is used to store food at low temperatures to prevent spoilage, but how much should the temperature be lowered? When the Zero-th Law is applied, we can determine the ideal temperature for storage and distribution, helping prolong the shelf life of food. In conclusion, I must say that as you see, understanding the Zero-th Law is essential in various fields and industries. And it helps us set fixed temperature scales, ensuring precision and accuracy in temperature measurement. From AC unit to food storage, the Zero-th Law of Thermodynamics is truly everywhere. And it is fascinating to see how a fundamental law can have such a broad impact in our lives. So I think it's enough for today. So thank you very much for listening and watching. I hope you enjoyed the video. I hope this video is useful for you. So take care of yourself and don't hesitate to write an email if you have any question, Qree suggestion and even classes are required. Take care of yourself, meanwhile. See you in the next video. Goodbye.