In general it equals a 5 iron.
It really depends on manufacturer. It could equal either a 3 iron or 4 iron.
1535 degree melting of iron
A 3 iron is usually 21 degrees and and 4 iron 24 degrees, so a strong 4 iron. Depends on manufacturer really. And also remember the shafts on hybrids are slightly longer, perhaps by an inch which means the ball goes further.
If the iron has an "A" on the sole, it's an "Approach" wedge, otherwise known as the "Gap" wedge. It fills the gap between pitching wedge and sand wedge. It is usually 52 degrees of loft, plus or minus a degree. It's a great asset on the course. I carry one instead of carrying a 4 iron.
According to several places a club with a 19 degree loft could be anything from a 4 wood to a 3 iron. So basically it might be a 4 or 5 wood as well as a 3 iron especially if its a 3 iron hybrid.
A 3 wood has 15 degrees of loft, and as it has a longer shaft you would probably have to go for a 14 degree hybrid as a replacement. But a 15 or 16 degree one would be easier to hit and easier to control, so probably a better choice.
Iron melts at approximately 2800 degrees Fahrenheit.
4 iron
No, lighter can produce 120 degree Celsius temperature where as soldering iron can produce 420 degree Celsius temperature. the soldering iron is used to join two metal wires.
No. The iron would melt, which is a physical change.
A 3 iron is normally about 21 degrees. A 20 degree hybrid will act like a 2 iron, yes a 3 iron normally is 21 degrees, obviously the hybrid is 1 degree stronger, but it is also slightly longer which will also increase distance.