The Atlantic Ocean contains 310,410,900 cubic kilometers of water. This is a hard number to grasp, but, for reference, Lake Tahoe contains ~150 cubic kilometers of water. Or, another way of looking at it is that 1 cubic kilometer = 264.17 billion gallons. So, doing a simple conversion, the Atlantic Ocean contains 82 billion billion gallons. That's a lot of water!

According to Wikipedia, "The volume of the Atlantic with its adjacent seas is 354,700,000 cubic kilometers (85,100,000 cu mi) and without them 323,600,000 cubic kilometres (77,640,000 cu mi)." Converting this to liters, this is approximately 3 x 10²⁰ L! Wow. That's a lot of water!

The Atlantic Ocean contains around 310,410,900 cubic kilometers of water. To put this into perspective, if humans could live underwater, every person in the US could occupy their own cubic kilometer of the Atlantic. That's a lot of water!

The thing about the oceans is that they're all connected. However, the Atlantic covers roughly 20% of the Earth's surface, and has about 320 million cubic kilometers of water (roughly 80 million cubic miles). You likely know how long a mile is, but it might be hard to imagine 80 million cubic miles. If you took a box that is a mile high, by a mile wide, by a mile long (that's a big box!); you would have enough water to fill 80 million of those boxes. When numbers get this big, they don't even make sense. Moral of the story: there's a lot of water in the Atlantic Ocean.