Final answer:
Three physical variables of a goldfish bowl include temperature, lighting, and volume of water. These factors are crucial for the health and well-being of a goldfish.
Step-by-step explanation:
When discussing a goldfish bowl, three key physical variables that can be measured or observed are:
- Temperature: The warmth or coolness of the water, which is crucial for the health of the goldfish. You can experiment with different temperatures using buckets of room temperature water, hot water, and very cold water to understand how temperature affects water properties.
- Lighting: The intensity and quality of light, which can affect algae growth and the goldfish's behavior. Using a bright light source like a pen light can help you see changes in how light interacts with water and the fish within.
- Volume of Water: The amount of water in the bowl, which determines how much living space the goldfish has and affects water quality. Understanding volume can be enhanced by comparing water in differently sized containers like a water bottle, eyedropper, or a bucket.
Each of these variables can influence a goldfish's environment and, ultimately, its well-being.