Yo, folks! I'm a supplier of 18/8 vacuum thermos, and I often get asked, "Can an 18/8 vacuum thermos keep liquids cold?" Well, let's dive right into it and find out.
First off, what the heck is an 18/8 vacuum thermos? The "18/8" refers to the composition of the stainless - steel used in making the thermos. It means that the steel contains 18% chromium and 8% nickel. This type of stainless - steel is super durable, resistant to corrosion, and doesn't impart any weird taste to your drinks.
Now, the vacuum part is the real magic behind keeping liquids cold. A vacuum thermos has a double - walled construction with a vacuum between the two walls. You might be wondering, "What's so special about a vacuum?" Well, a vacuum is a space devoid of air. And air is a pretty good conductor of heat. By removing the air between the two walls, we cut off one of the main ways heat can transfer.
Let's talk about the three ways heat can move: conduction, convection, and radiation. Conduction is when heat travels through a material, like when you touch a hot pan and feel the heat in your hand. Convection is the movement of heat through a fluid, like hot air rising in a room. Radiation is the transfer of heat through electromagnetic waves, like the heat you feel from the sun.
In an 18/8 vacuum thermos, the vacuum between the walls stops conduction and convection. Since there's no air to carry the heat, it can't move from the outside of the thermos to the inside. The 18/8 stainless - steel walls also help reduce radiation. The shiny surface of the steel reflects a lot of the radiant heat, so it doesn't penetrate the thermos.
So, in theory, an 18/8 vacuum thermos should be really good at keeping liquids cold. But how well does it actually work in the real world?
I've done some tests with our 18/8 Insulated Thermos Vacuum Flask. We filled it with ice - cold water and left it out in the sun on a hot summer day. After 24 hours, the water was still cold! Not ice - cold, but definitely a lot colder than the outside temperature.
The performance of an 18/8 vacuum thermos can depend on a few factors. The quality of the vacuum is crucial. If there's even a tiny leak in the vacuum, air can get in, and heat transfer will start happening. The thickness of the stainless - steel walls also matters. Thicker walls can provide better insulation, but they also make the thermos heavier.
Another factor is how you use the thermos. If you pre - chill the thermos before filling it with cold liquids, it'll do an even better job of keeping them cold. Just fill the thermos with ice water and let it sit for a few minutes before emptying it and adding your drink.
Our Double Wall Vacuum Insulated Bottle is a great example of a high - quality thermos. It's designed with a really good vacuum seal, and the 18/8 stainless - steel walls are just the right thickness. Whether you're taking it on a hiking trip, to the gym, or just using it at work, it'll keep your drinks cold for hours.
The Double Wall Vacuum Thermos is another top - notch product. It has a larger capacity, so it's perfect for families or groups. And like all our 18/8 vacuum thermoses, it's built to last.
In conclusion, yes, an 18/8 vacuum thermos can definitely keep liquids cold. Thanks to the combination of the 18/8 stainless - steel and the vacuum insulation, it's a great choice for anyone who wants to keep their drinks cold on the go.
If you're in the market for a high - quality 18/8 vacuum thermos, whether it's for personal use or you're looking to stock up for your business, we're here to help. We offer a wide range of products at competitive prices. Get in touch with us to discuss your requirements and let's start a great business relationship.
References
- Principles of Heat Transfer, Incropera and DeWitt
- Handbook of Thermal Insulation, ASHRAE
