The space in the thoracic cavity between the concave inner surfaces of the lungs, in which (in a special pericardial cavity) the heart is located, is called the mediastinum. The thoracic cavity is lined with a serous membrane called the pleura. The lungs are enclosed in the so-called pleural cavities, which are separate in man but communicate with one another in the majority of mammals. The shape of the thoracic cavity depends upon the shape of the thorax and the position of the diaphragm.
We sell 5 hammock sizes on the Traditional Hammocks (no spreader wood bars). Therefore, the length of the hammock is the same for each size but the difference is the width. Width gives the size. The larger the size, the wider and bigger the hammock.
It's easiest to hang your hammock in a space at least 1 foot (30 cm) longer than the overall length of the hammock. For example, a 10' hammock requires two posts or trees 11' apart. The screw hook should be mounted anywhere from 5 to 6 feet (1.5 m to 1.8 m) above the ground. You may wish to hang it higher or lower depending on the distance between your supports and on your personal preference.