The density of water is 1 × 103kg/m3, according to the definition of density can be known as its physical significance: 1 cubic meter of water contains the mass of the material for 1000kg; water specific heat capacity is 4.2 × 103J / (kg?℃), according to the definition of the specific heat capacity can be known as its physical significance: 1 kg of water temperature increase (decrease) 1 ℃ of the heat absorbed (released) is 4.2 × 103J. water. Specific heat capacity of water is larger in life, there are many applications, such as water to cool the car engine, cultivate rice seedlings to the paddy water, winter heating with water as circulating fluid and so on.

The answer: 1 × 103kg/m3; 1 cubic meter of water contains the mass of 1000kg of material; 4.2 × 103J / (kg? ℃); 1 kg of water temperature rise (lower) 1 ℃ absorbed (released) heat for 4.2 × 103J; (1) water-cooled engines; (2) water bath rice seedlings