👉 Indoor fluid, commonly known as indoor humidity or indoor moisture, refers to the water vapor present in enclosed spaces such as homes, offices, and buildings. This moisture originates from various sources including human activities like cooking, showering, and breathing, as well as external factors like rainwater penetration through windows or doors. High levels of indoor fluid can lead to discomfort, damage to materials and electronics, and promote the growth of mold and mildew, impacting indoor air quality and overall well-being. Managing indoor fluid through proper ventilation, dehumidification systems, and moisture-resistant building materials is crucial for maintaining a healthy and comfortable indoor environment.