How much heat is needed to give a second degree burn how long does the skin need to be in contact?

There isn't really a definite answer related to temperature for partial thickness burns. The depth and severity of the burn, in this case the partial thickness or 2nd degree burn, is dependent on both the temperature and the time exposed to the heat source. The longer the exposure, the lower the temperature required to create a partial thickness burn. On the other hand, the higher the temperature, the shorter the exposure is necessary to create the partial thickness burn.

How much heat is needed to give a second degree burn how long does the skin need to be in contact?
Not sure of the answer to either one but if the skin blisters, it is at least a second degree burn. That can happen by just touching a pan right out of the oven for 5 seconds.
Reply:A lot of sunburns can range from 1st to 2nd degree. The longer the exposure to the sun, more likely the chance of 2nd degree. Plus it also depends on the color/pigmentation of a persons' skin, time of year and how often and how long the person has been exposed to the sun. With any other type of burning agent, long enough to cause blisters to form on the skin.
Reply:Not a question of heat as in temperature but about how much damage it does - usually as a result of how intense and localized the injury is - for instance steam can burn you in mere seconds while could take hours to get a bad sunburn which could also be "2nd degree" but because the sunburn is a larger area it might be considered more severe