The SI unit for energy (including heat energy) is the joule. It is still quite common, in many cases, to use the old unit calorie instead.
You should convert metric measurements to standard US measurements when you need to communicate with someone who is more familiar with the US system, or if the specific context or requirements you are dealing with call for the use of standard US measurements.
Sort of. US measurements are now for the most part defined in terms of SI units. Also, a few SI units such as "seconds" are used directly.
Its own. The US is one of a small number of recalcitrant countries that has not adopted the metric system. Furthermore, it had not adopted the Imperial standard either, with the US gallon, for example, being different from elsewhere in the world at that time.
We use heat in our homes to keep us warm during the winter. We also use heat in our home espcailly in our kitchen to heat our food.
Germany, in line with the rest of the world except the U.S., uses the metric system.
that's the way its measured in the US. the rest of the world uses Celsius as it is the metric unit.
because the rest of the world does not use American measurements
We use heat for cooking, ironing clothes, and to keep us warm.
We need standard measurements because it helps us to find the measurements of things.
The right triangle helps us find many measurements in the world. There are many right triangles in the world, and they help us create many structures.
In the SAE, Imperial and US Customary systems, we normally use inches, feet, yards and miles. In the metric system, used in all scientific measurements, we use various degrees of the meter, including the millimeter, centimeter and meter for larger measurements and divisions such as the nanometer (one billionth of a meter) for microscopic measurements. For atomic and molecular sized measurements, we use angstrom units (one ten billionth of a meter).
SI is used worldwide. As scientists, many of their ideas are going to be shared with colleagues within the US and overseas. Therefore, it's easier to use SI in order to keep the conversions to a minimum.