010203
20oz BPA -Free SS Vacuum Water Bottle For Sport
Capacity | Bottom He | Mouth Him | Heigth | Weight | Remark |
|
20oz/ 600ml |
7.2cm |
8cm |
25cm |
350g | Vacuum insulated, With lid ,strap and straw, |
1. 20-ounce insulated stainless-steel water bottle,double-wall insulation keeps drinks cold for up to 24 hours; wide opening for cleaning and adding ice; cup holder-friendly base
2. A spout and push-button lid with lock ,spout designed for either sipping upright through the built-in straw or tilting back to swig from the spout opening
3. Protective push-to-open lid keeps spout clean; convenient carry loop doubles as a lock
4. BPA and phthalate-free; hand wash cup, dishwasher-safe lid; not for use with hot liquids
How dose the bottles insulate
1. The working principle of the stainless steel thermos cup is to use its double-layer structure to form a vacuum-sealed space between the inner wall and the outer wall. This vacuum space helps minimize heat transfer through conduction, convection, and radiation, allowing the insulated cup to effectively maintain the temperature of the liquid inside.
2. Conduction: The double-walled design of the stainless steel cup prevents direct contact between the inner and outer walls holding the liquid. Therefore, when two objects of different temperatures are in direct contact, heat transfer by conduction is significantly reduced.
3. Convection: The vacuum-sealed space between the inner and outer walls of the cup eliminates air that would otherwise act as a medium for transferring heat through convection. Without a medium to transfer heat by convection, the rate of heat loss or gain is minimized, helping to maintain the temperature of the liquid within the cup.
4. Radiation: Stainless steel has a low emissivity, which means it does not dissipate thermal radiation as efficiently. The inner wall of the insulated cup is in direct contact with the liquid and acts as a radiation barrier to prevent heat transfer through radiation. This further contributes to the thermos cup’s ability to retain heat.
5. In short, the stainless steel thermos cup utilizes its double-layer structure, vacuum sealed space and low emissivity of stainless steel to minimize heat transfer by conduction, convection and radiation. This allows the cup to keep the liquid inside at the desired temperature for a long time.