A homeowner does not "adjust" an oven that is set up to work on liquid propane (LP) so that it can be used with nautral gas. What must happen is that the gas jets in the burners must be replaced, and this is not generally a job for a homeowner. Call your LP supplier or the gas company to get the scoop. They are professionals who hand out information like this to folks like you just for the asking. They actually want you to call. That way you don't end up in a jam because you dove headlong into modifications that, if done improperly, can end up killing you and/or your family and/or destroying your home. Talk is cheap, so make the call.
Twist the collar.
You adjust a rotatable thing at the bottom, normally there is a hole that will become either closed or open to change the flame.
Rotating the barrel of the burner.
There's not enough air (oxygen) in the gas-air mix. Often gas stoves have an adjustment that allows you to adjust the mix. Adjust the mix until the flame is entirely or almost entirely free of yellow.
No The temperature of the candle flame is out of the temperature range of the clinical thermometer.
To adjust gas flow therefore adjusting flame intensity.
Rotating the barrels for the access of more air (oxygen).
Many cooks prefer a gas range because the heat under the pan is much more quickly adjusted by turning the flame up or down. Electric elements respond very slowly compared with a gas burner. A precise heat level is also easier to adjust and maintain on a gas range.
it can fire 37 feet.
No, the blue part is the hottest. In fact, you should adjust the burner so that you only have a blue flame. A yellow/orange/red flame is indicative of incomplete combustion (generating carbon monoxide).
Adjust the rotating air-inlet sleeve at the bottom on the spout.
Etanol is burning with a faint blue-ish flame color