Final answer:
The temperature at which water has the same density as at 1°C is 0°C.
Step-by-step explanation:
The density of water at 4°C is the maximum density of water. As the temperature decreases or increases from 4°C, the density of water decreases. Therefore, in order to find the temperature at which water has the same density as at 1°C, we need to find a temperature where the density is equal to the density at 1°C, which is less than the maximum density at 4°C.
Based on the information provided, the temperature at which water has the same density as at 1°C is 0°C. This is because the density of water at 0°C is close to the density of water at 1°C, and it is less than the maximum density at 4°C.