 Hello, this is Professor Steven Esheba, and I want to share a little bit about entering numbers in scientific notation into a spreadsheet. So as examples here, I've got a spreadsheet up here, and I've already put in a label that is to say this is just telling me that I want to enter the mass of the earth, and I happen to know that the mass of the earth is 5.97 times 10 to the 27 kilograms. So the way you enter a number in, you know, the best way, the way I recommend, is to use scientific notation in spreadsheet language, if you like, which goes like this, 5.97. That's the first part, and then to express the 10 to the 27th, I'm going to go E 27, and that E could be capital or lowercase, but it can't have a space between the number and the E, okay? And as you can see, it's now sort of echoed back to me that that's, that's the number. For Avogadro's number, let's see if I can remember what that number is. Oh, that's 6.02 times 10 to the 23rd, so I'm going to say 6.02 E 23. Oops. 6.02 E 23, okay? And same thing, if we just keep on going, let's see, the mass of a proton is 1.67 times 10 to the minus 27, and that kind of goes in a similar way. I'm going to say 1.67, 1.67 E, and now if you want to have a minus 10 to the 10 to the exponent of the power of 10, I would go minus 27, just like that, and so on. Now, you don't always have to enter numbers in scientific notation if they're easy, like if I know that the pressure is 1 atmosphere, I can just say 1. If I know that the volume is a quarter of a liter, I can just say 0.25, that's fine. Temperature in Kelvin, well, that's 298 is the typical room temperature, and so on.