Expressing scientific notation and units in speech


I've got two related questions:

1) How do you say numbers in scientific notation in Japanese? For example,
3x108 is spoken in English as "three times ten to the eight". Do negative
exponents works the same as ordinary negative numbers (i.e. prefix with マイナス)?

2) How do you say the units? For example m s-1 ("meters per second" - you get
no prize for guessing why I'm asking ;) ), or more complicated examples like
kg m2 s-2 K-1 ("kilogram metres squared per second squared kelvin").




1) three times ten to the eight = 3[掛]{か}ける10の8[乗]{じょう}

For negative, insert マイナス before the (number)乗, after the の.

2) ms^-1 = メートル[毎秒]{まいびょう}

kg m^2 s^-2 K^-1 = ジュール[毎]{まい}ケルビン

