A standard unit should not change with respect to time but may change from place to place.

Answer

To determine whether the statement "A standard unit should not change with respect to time but may change from place to place" is true or false, we can analyze the concepts of standard units in measurements.

### Step-by-Step Solution:

1. **Understanding Standard Units**:
- Standard units are defined measurements that are universally accepted and used to ensure consistency in scientific communication and calculations. Examples include meter for length, kilogram for mass, and second for time.

2. **Consistency Over Time**:
- A standard unit must remain constant over time. This means that a meter measured today should be the same as a meter measured in the future. If the definition of a meter were to change over time, it would lead to confusion and inconsistency in measurements.

3. **Variability Across Locations**:
- While standard units are consistent over time, they can be used in different locations. For example, a meter in London is the same as a meter in New York. However, the application or context of measurements might vary based on local standards or practices, but the unit itself remains unchanged.

4. **Conclusion**:
- The statement in question is false. A standard unit should not change with respect to time, and it should also not change from place to place. The essence of standard units is their universality and consistency, which facilitates clear communication among scientists and researchers globally.

### Final Answer:
The statement is **false** because standard units do not change with respect to time or place.

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