Chapter 1 Introduction Scientific notation(科学记数法(p4) Write numbers in“ powers of ten” Mass of the earth: 5,980,000,0000000kg or 5.98x1044kg Diameter of proton(质子) 0.000000000000001m or 10-15m(or 1 E-15 on computers) The advantage is that it allows the number of significant figures to be clearly expressed.Chapter 1 Introduction Mass of the Earth: 5,980,000,000,000,000,000,000,000kg or 5.98x1024kg Diameter of proton（质子）: 0.000000000000001m or 10-15m (or 1 E-15 on computers) The advantage is that it allows the number of significant figures to be clearly expressed. Scientific notation (科学记数法(p4) Write numbers in “powers of ten