Abstract: A measurement unit (101) acquires a first value serving as a thermal conductivity index and a second value serving as a thermal diffusivity index, with respect to a fuel gas to be measured, at a first temperature, a second temperature, and a third temperature that are different from each other. A change rate calculation unit (102) calculates a temperature change rate ?1 of the first value between the first temperature and the second temperature, measured by the measurement unit (101), a temperature change rate ?2 of the first value between the second temperature and the third temperature, a temperature change rate ?1 of the second value between the first temperature and the second temperature, and a temperature change rate ?2 of the second value between the second temperature and the third temperature.

Abstract: A measurement unit (101) acquires a first value serving as a thermal conductivity index and a second value serving as a thermal diffusivity index, with respect to a fuel gas to be measured, at a first temperature, a second temperature, and a third temperature that are different from each other. A change rate calculation unit (102) calculates a temperature change rate ?1 of the first value between the first temperature and the second temperature, measured by the measurement unit (101), a temperature change rate ?2 of the first value between the second temperature and the third temperature, a temperature change rate ?1 of the second value between the first temperature and the second temperature, and a temperature change rate ?2 of the second value between the second temperature and the third temperature.

Abstract: A contact probe having a substantially flat plate shape, used to connect different substrates and having a uniform plate thickness includes: a first contact portion which has a side surface curved in an arc shape and which makes contact with one substrate at the side surface thereof; a second contact portion which has a side surface curved in an arc shape and which makes contact with the other substrate at the side surface thereof; a connection portion which connects the first contact portion and the second contact portion; and an elastic portion which extends from the second contact portion, has a portion curved in an arc shape, and is elastically deformed by a load applied to the first contact portion and the second contact portion.