exa是什么意思 exa的读音、翻译、用法

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'exa'不是一个语言,它表示十的18次方。在计量学中,它用于表示极微小的数值,比如分子的质量或者原子的尺寸。

例句:

1. The mass of a proton is approximately 1.67 x 10^-27 kg.(质子的质量约为1.67 x 10^-27千克。)

2. The diameter of a hydrogen atom is about 0.1 nanometers, or 1 x 10^-10 meters.(氢原子的直径约为0.1纳米,或1 x 10^-10米。)

3. The speed of light is approximately 3 x 10^8 meters per second.(光速约为每秒3 x 10^8米。)

4. The estimated age of the universe is around 13.7 x 10^9 years.(宇宙的估计年龄约为13.7 x 10^xx年。)

5. The human genome contains around 3 x 10^9 base pairs.(人类基因组含有约3 x 10^9个碱基对。)

6. The distance between the sun and the Earth is approximately 1.5 x 10^11 meters.(太阳和地球之间的距离约为1.5 x 10^11米。)

7. The melting point of iron is around 1.538 x 10^3 degrees Celsius.(铁的熔点约为1.538 x 10^3摄氏度。)

8. The estimated number of stars in the Milky Way is around 1 x 10^11.(银河系中的恒星数量约为1 x 10^11。)

9. The Earth's gravitational force is approximately 9.81 meters per second squared, or 9.81 x 10^0 m/s^2.(地球的重力约为每秒9.81米平方,或9.81 x 10^0 m/s^2。)

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