  Earth's atmosphere, on the other hand, is mostly nitrogen (78%) and oxygen (21%) with 1% being a mix of hydrogen, carbon dioxide and others. So you can see that Mars has much less atmosphere than the Earth does and oxygen make a proportionally much smaller fraction of of what there is than what we have on Earth.
Pickup trucks come in different shapes and sizes, and their weight entirely depends on the make and model. On average, a common pickup truck can weigh up to 3 tons, equivalent to 6,000 pounds.
A short tone is considered 2,000 pounds while a long ton weighs in 2,240 pounds. A short ton is also equal to 907.18474 kilograms or 32,000 ounces. Large objects such as cars and elephants are measured using tons. An average sized car weighs around 2 tons, while elephants can easily weigh more than 5 tons when fully grown. A cup is equal to 8 ounces and a pound is equal to 16 ounces. Pounds and ounces are common measurements for most objects including animals and food.