The statement that a 1-meter length is kept at 0 degrees Celsius is incorrect. There is no standard practice or scientific principle that dictates a specific temperature for defining a meter.

Here's why:

* The meter is a fundamental unit of length: It's defined based on the speed of light in a vacuum, not temperature.

* Length changes with temperature: Materials expand when heated and contract when cooled. This is called thermal expansion. While a 1-meter ruler might be calibrated at a specific temperature, it's not the defining characteristic of a meter.

* Temperature is a factor in measurement: Temperature does play a role in measuring length accurately. If you need precise measurements, you might need to account for the temperature of the object being measured and the measuring device.

To summarize:

* The meter is a fundamental unit defined independently of temperature.

* Temperature influences the length of objects but doesn't define the meter itself.

If you're looking for a specific temperature at which a standard meter stick might be calibrated, it's likely to be around room temperature (around 20 degrees Celsius) to allow for practical use.