1, according to the heat of high-temperature water: GJ, that is, the ninth joule of 10? It is/kloc-0 1000000000 joules;
Heat means that when the change of system state comes from the destruction of thermal balance conditions, that is, from the temperature difference between the system and the outside world, we say that there is thermal interaction between the system and the outside world.
2. Steamed tons: tons.
Ton is a Chinese character, pronounced as dūn, which is often used as a unit of mathematical quality, and is often used to measure the weight of larger items in life. This character is recorded in Ugly Collection and Kouzibu.
The unit of measurement refers to a specific quantity defined and adopted by agreement, which is used to quantitatively express the size of the same quantity. All kinds of physical quantities have their own units of measurement, and the number of selected substances displayed under specified conditions is the standard of basic units of measurement. The choice of basic quantity can be different in different periods and disciplines.
For example, in physics, seven physical units, such as time, length, mass, temperature, current intensity, luminous intensity and quantity of matter, are taken as basic quantities, and their unit names are seconds, meters, kilograms, kelvin, amperes, Candeira and moles.
Extended data:
derived unit
Derived quantity
Other quantities derived from basic quantities according to relevant formulas are called derived quantities. The unit of export quantity is called export unit. For example, the unit of speed consists of length and time unit, which is expressed by "meter/second".
Combined unit
Units composed of units of other quantities are called combined units. For example, the unit of pressure (Pa) can be composed of the unit of force (N) and the unit of area (m 2), that is, n/m 2.
China's legal unit of measurement adopts the international system of units, and its internal uses include:
1, the basic unit of the international system of units
2, the international system of units auxiliary units
3. Export the units with special names in the international system of units.
4. Chinese legal units of measurement that can be used together with the international system of units.
5. Form of combined units composed of the above units
6. Decimal multiples and decimal units composed of prefixes and above.
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