Thermometer is an instrument use for measuring temperature that is the degree of hotness and coldness
The temperature of boiling water cannot be measured by clinical temperature or thermometer because it can only measure temperature ranges from 30 to 40°c and the temperature for boiling water is 100°c.
Temperature of boiling water cannot be measured by a Clinical thermometer The reason behind this is that the range of clinical thermometer varies between only 35° C to 42° C.
The pressure of gas will increase because gaseous state is the final state and even if the heat added is evaporating some more gas is still added. It also depends on the temperature of heat added, if the temperature doesn't change the it's most likely for the pressure to be stable... Hope it helps