Say aliens have abducted you. After probing you for a while, they get bored and drop you off wherever they choose. You look around you and see nothing but forests and snow-capped mountain peaks. And the only instruments you have on you are your lucky lighter and a thermometer that they left in your . . . let's say your mouth. What vital data about your whereabouts can you get using just those tools?
For one thing, you can determine the temperature of the place, and that's very helpful, I'm sure, but you can also dabble in the art of hypsometry. Hypsometry is the ability to measure height. In this case, you're measuring your own height, with respect to sea level. Start by heading for those forests and gathering wood. You'll need it. You'll also need a broad leaf, or perhaps some paper cups that hikers, or other abductees, have left behind. Start a fire, keeping it very low. Suspend a cup, or a broad leaf, over the fire and fill it with water. We've seen that, as long as it's filled with water, it can't burn.