### dimensionless

[daɪ'mɛnʃənlɪs]
• n. 无穷小量
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1. The physical meaning of dimensionless numbers cannot usually be formulated clearly.

2. Dimensionless quantities in physics are those that require no unit.

3. The numerical procedure has been derived in dimensionless form.

4. Awed by the dimensionless task, students struggle with uneven success to assimilate and survive.

5. A very useful tool for scale - up is the dimensionless group.